Clare MulroyUSA TODAY
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Do you know someonewho has thesame birthday as you?
According to the "birthday paradox,"in a random group of 23 people, there is about a 50% chance two people will share abirthday. Any more than that, and it gets increasingly likely that a pair of matching birthdays exist.
According to birth data from the Centers for Disease Control and Prevention and the Social Security Administration, here are themost popular days to blow out the candles in the United States.
What is the most common birthday?
The most common birthday is Sept. 9. In second and third place are Sept. 19 and 12.
In fact, the entire top 10 list is made of September birthdays between Sept. 9 and 20. Count backwardand you’re just in time for the holidays, since pregnancy is an average of 40 weeks from last menstruation.
Why the holidays? Perhaps because there’s more holiday cheer in the air, and it could have something to do with the fact that many people have freetime on vacation days they take aroundChristmas and New Year’s, to celebrate with family and friends. There’s also the general sense of romance around the holidays — December is the most popular month to get engaged. One study even found a 9.1% peak in conception at the end of the year.
Scroll down to check out the full list of birthdays from mostto least common.
Celebrities born on Sept. 9
If you were born on the most popular day of the year, here are a few celebs you share a birthday with:
- Adam Sandler
- Hugh Grant
- Michelle Williams
- Michael Bublé
- Eric Stonestreet
- Zoe Kazan
- William Miller
- Kelsey Asbille
- Henry Thomas
- Constance Marie
It's Gemini season! The social butterfly's personality traits, explained
What is the most common birth month?
Though September dominates the top ten most common birthdays, August is actually the most common birth month.
According to the birth data, there were just under 7,600,000 births in August between 1994 and 2014. The second most common birth month is July, with 7,500,795 births and September in third place with 7,411,299. It’s worth noting, though, that both July and August have 31 days in the month while September only has 30.The least common birth month is predictably February, which only has 28 days.
Birthmonths of the year, in order of most common to least common:
- August
- July
- September
- October
- May
- December
- March
- June
- January
- November
- April
- February
What is the rarest birthday?
The least common birthday is leap day, or February 29. But because the day only occurs once every four years, it’s obvious itwould yield the least amount of birthdays.
The rarest birthday of the 365 annual calendar days is Christmas Day, Dec. 25.
If your birthday is New Year’s Day or Christmas Eve, you also have uncommon birthdays. Jan. 1 and Dec. 24 are just below Christmas onthe list.
Late November birthdays are also pretty rare as Thanksgiving celebrations ramp up in the United States. Nov. 23-28 all fall between 354 and 360 out of the 365 calendar days. And July 4th, which occurs in the second most popular birth month, is 363rd on the list.
According to a working paper from the National Bureau of Economic Research, there are 18% less births on the day of and just after a holiday. Around half of the decline is due to fewer cesarean sections scheduled on holidays, in part because of low hospital staffing numbers on the holiday and cultural attitudes — parents’ desires to separate fixed holidays and birthdays.
Celebrities born on Dec. 25
If you're a Christmas baby born in Capricorn season, here are the famous figuresyou share a birthday with:
- Jeremy Strong
- Justin Trudeau
- Jimmy Buffett
- Clara Barton (1821-1912)
- Humphrey Bogart (1899-1957)
- Annie Lennox
- Rod Serling(1924-1975)
Birthdays: Most common to least
- Sept. 9
- Sept. 19
- Sept. 12
- Sept. 17
- Sept.10
- July 7
- Sept. 20
- Sept. 15
- Sept. 16
- Sept. 18
- Dec. 20
- Sept.26
- Sept. 8
- Sept. 23
- Dec. 29
- Aug. 8
- Sept. 24
- July 8
- Dec. 19
- Aug. 29
- Aug. 15
- Sept. 22
- Dec. 30
- Sept. 14
- Sept. 25
- Sept. 27
- July 1
- Dec. 28
- Aug. 28
- July 2
- Aug. 22
- Sept. 21
- Sept. 13
- Aug. 30
- July 11
- Aug. 16
- Aug. 1
- July 18
- Aug. 20
- July 9
- July 16
- July 25
- July 15
- Aug. 12
- July 10
- Aug. 27
- Aug. 9
- Oct. 1
- July 17
- July 23
- Aug. 14
- July 22
- Aug. 18
- July 14
- Dec. 21
- Dec. 18
- Oct. 3
- Dec. 27
- July21
- Aug. 23
- Aug. 21
- Aug. 19
- Feb. 14
- Aug. 26
- July 28
- Aug. 5
- Aug. 11
- July 24
- July 30
- July 29
- June 27
- Aug. 7
- Aug. 6
- July 26
- Aug. 2
- Aug. 25
- Oct. 2
- Sept. 29
- Aug. 4
- Nov. 21
- July 12
- June 28
- Oct. 10
- Aug. 31
- Sept. 28
- Aug. 17
- June 30
- July 19
- May 23
- July 31
- Sept. 11
- June 20
- Aug.10
- Oct. 4
- Sept. 30
- July 6
- Dec. 17
- Aug. 13
- Aug. 24
- Nov. 20
- Dec. 12
- Sept. 5
- July 20
- July 27
- June 25
- Sept. 7
- Dec. 22
- June 26
- May 24
- Dec. 16
- June 29
- Nov. 1
- June 2
- June 18
- Oct. 6
- Aug. 3
- June 24
- Oct. 7
- Oct. 8
- Nov. 7
- July 3
- June 21
- Oct. 17
- Sept. 6
- June 14
- May 22
- May 16
- Oct. 24
- Oct. 5
- Oct. 11
- June 16
- Oct. 15
- June 3
- Nov. 19
- May 21
- June 17
- Dec. 1
- June 23
- June 6
- Nov. 14
- Nov. 15
- June 10
- June 4
- April 4
- Sept. 4
- June 12
- May 20
- Nov. 5
- Dec. 15
- Feb. 15
- Oct. 25
- Dec. 2
- March21
- July 13
- Nov. 8
- June 19
- Nov. 18
- June 5
- June 1
- June 7
- June 11
- May 15
- Oct. 22
- Oct. 18
- Oct. 14
- Feb. 7
- Dec. 3
- Nov. 11
- March17
- Oct. 9
- Dec. 5
- Nov. 3
- June 22
- March 1
- Nov. 4
- Nov. 17
- May 17
- Sept. 3
- March 14
- Oct. 16
- May 2
- Feb. 22
- Oct. 28
- March 7
- June 9
- Nov. 6
- Nov. 2
- June 15
- Nov. 12
- March 3
- May 5
- May 10
- May 14
- Oct. 20
- Feb. 8
- April 11
- Oct. 21
- Feb. 28
- Jan. 24
- Oct. 23
- March 28
- June 13
- May 9
- Nov. 10
- Oct. 27
- June 8
- Jan. 10
- Nov. 16
- Jan. 4
- May 12
- Feb. 10
- Feb. 11
- Oct. 12
- Oct. 29
- March 15
- Feb. 21
- April 2
- April 18
- March 12
- March 20
- May 1
- Sept. 2
- May 19
- April 25
- March 4
- Dec. 4
- March 5
- March8
- Jan. 14
- Jan. 11
- March 25
- Feb. 25
- March 22
- Dec. 6
- May 8
- March 18
- Jan. 5
- April12
- Dec. 14
- Dec. 10
- Jan. 25
- May 6
- Feb. 2
- Feb. 16
- May 7
- Feb. 18
- March 10
- Jan. 12
- March 11
- Sept. 1
- Feb. 1
- Oct. 26
- Feb. 23
- Nov. 9
- Jan. 7
- March24
- March 6
- March 19
- Jan. 6
- April 16
- Feb. 4
- Feb. 24
- May 3
- Jan. 17
- May 30
- April 5
- May 18
- April 3
- Feb. 12
- April 17
- March27
- Feb. 9
- Dec. 8
- April 19
- April 8
- March26
- Feb. 20
- Jan. 18
- Jan. 31
- Dec. 11
- April15
- April 26
- April 22
- March 29
- Jan. 23
- April 23
- April 7
- Feb.27
- Nov. 30
- Dec. 13
- Feb. 17
- Oct. 19
- Dec. 9
- April 24
- Jan. 26
- Feb. 3
- Jan. 28
- April9
- May 25
- April10
- Jan. 20
- Jan. 21
- Jan. 27
- April 21
- Oct. 30
- Jan. 3
- April 14
- April 28
- March 2
- May 28
- Feb. 6
- May 29
- March 31
- March 16
- Oct. 13
- March 9
- Nov. 29
- Jan. 30
- May 11
- Nov. 13
- Dec. 7
- March23
- April 29
- April 30
- Feb. 26
- May 31
- May 4
- April 20
- March 30
- May 13
- May 27
- Jan. 19
- Feb. 5
- Jan. 22
- Feb. 19
- April 27
- Nov. 22
- March 13
- April 6
- Jan. 9
- Jan.16
- Jan. 13
- Jan. 8
- Feb. 13
- Jan. 29
- Jan. 15
- July 5
- May 26
- Dec. 31
- April 13
- Dec. 23
- April 1
- Nov. 28
- Nov. 26
- Nov. 24
- Oct. 31
- Nov. 25
- Nov. 23
- Nov. 27
- Dec. 26
- Jan. 2
- July4
- Dec. 24
- Jan. 1
- Dec. 25
- Feb. 29
Birthday freebies: Score these items from your favorite stores
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