The O'CALLAHAN surname in the USA

Frequency Comparisons
	Total	Rank	Frequency %	Per million people
United States
United States (Current snapshot)	346	55481	0	1
United States (1880 census)	88	34198	0	2
Change since 1880	+258	-21283	+N/A	-1
Other Countries
Australia	0			0
United Kingdom	0			0

Top States for O'CALLAHAN by Total
State	Total	Rank in State	Frequency %	Per million people
Massachusetts	54	12785	0.001	9
New Jersey	45	19191	0.001	5
New York	36	43273	0.000	2
California	35	52988	0.000	1
Washington	23	26711	0.000	4
Top States for O'CALLAHAN by Frequency
State	Total	Rank in State	Frequency %	Per million people
Massachusetts	54	12785	0.001	9
Rhode Island	7	16592	0.001	7
New Hampshire	7	18478	0.001	6
New Jersey	45	19191	0.001	5
Alaska	3	28890	0.000	5

Notes

Total is the total number of people with that surname.
Rank is the position in the list of names ordered by total (eg, a rank of 1 means that it's the most common name, and a rank of 10 means it's the tenth most common, etc).
Frequency is the percentage of people with that surname.
Per million people is the number of people with that surname per million of the population.

'A figure of zero indicates that we don't have data for this name (usually because it's quite uncommon and our stats don't go down that far). It doesn't mean that there's no-one with that name at all!

For less common surnames, the figures get progressively less reliable the fewer holders of that name there are. This data is aggregated from several public lists, and some stats are interpolated from known values. The margin of error is well over 100% at the rarest end of the table!

For less common surnames, the frequency and "per million" values may be 0 even though there are people with that name. That's because they represent less than one in a million of the population, which ends up as 0 after rounding.

It's possible for a surname to gain in rank and/or total while being less common per million people (or vice versa) as there are now more surnames in the USA as a result of immigration. In mathematical terms, the tail has got longer, with a far larger number of less common surnames.

Figures for top states show firstly the states where most people called O'CALLAHAN live. This obviously tends to be biased towards the most populous states. The second set of figures show where people called O'CALLAHAN represent the biggest proportion of the population. So, in this case, there are more people called O'CALLAHAN in Massachusetts than any other state, but you are more likely to find a O'CALLAHAN by picking someone at random in Massachusetts than anywhere else.

Classification and Origin of O'CALLAHAN

Sorry, we don't have any origin and classification information for the O'CALLAHAN surname.

Ethnic distribution of O'CALLAHAN in the USA

Classification	Total	Percent
White (Caucasian)	333	96.24
White (Hispanic)	6	1.73
Asian/Pacific	Less than 100	Insignificant
Black/African American	None reported	0
Mixed Race	Less than 100	Insignificant
Native American/Alaskan	Less than 100	Insignificant

Ethnic distribution data shows the number and percentage of people with the O'CALLAHAN surname who reported their ethnic background as being in these broad categories in the most recent national census.

O'CALLAHAN is a genuine surname, but it's an uncommon one. Did you possibly mean one of these instead?

Similar names to O'CALLAHAN

The following names have similar spellings or pronunciations as O'CALLAHAN.

This does not necessarily imply a direct relationship between the names, but may indicate names that could be mistaken for this one when written down or misheard.