The O' BRIAN surname in the USA

Frequency Comparisons
	Total	Rank	Frequency %	Per million people
United States
United States (Current snapshot)	3,326	9036	0.001	12
United States (1880 census)	1,899	3117	0.004	38
Change since 1880	+1427	-5919	-0.003	-26
Other Countries
Australia	3	207723	0	0
United Kingdom	47	26316	0	1

Top States for O' BRIAN by Total
State	Total	Rank in State	Frequency %	Per million people
Florida	355	6547	0.002	22
New York	295	7774	0.002	16
California	232	12818	0.001	7
Texas	221	9542	0.001	11
Indiana	192	4771	0.003	32
Top States for O' BRIAN by Frequency
State	Total	Rank in State	Frequency %	Per million people
Delaware	27	5942	0.003	34
Indiana	192	4771	0.003	32
Montana	27	6260	0.003	30
Mississippi	66	4886	0.002	23
Florida	355	6547	0.002	22

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

Classification and Origin of O' BRIAN

Region of origin: British Isles

Country of origin: Ireland

Language of origin: Gaelic

Ethnic origin: Celtic

Religious origin: Christian

Name derivation: From name of parent

Data for religion and/or language relates to the culture in which the O' BRIAN surname originated. It does not necessarily have any correlation with the language spoken, or religion practised, by the majority of current American citizens with that name.

Data for ethnic origin relates to the region and country in which the O' BRIAN surname originated. It does not necessarily have any correlation with the ethnicity of the majority of current American citizens with that name.

Ethnic distribution of O' BRIAN in the USA

Classification	Total	Percent
White (Hispanic)	83	2.5
Black/African American	79	2.38
Mixed Race	46	1.38
Asian/Pacific	14	0.42
Native American/Alaskan	11	0.33
White (Caucasian)	3,093	92.99

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

Similar names to O' BRIAN

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

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.