Classification and Origin of ADAIR
| Region of origin | British Isles |
| Country of origin | Ireland |
| Language of origin | Gaelic |
| Ethnic origin | Celtic |
| Religious origin | Christian |
Data for religion and/or language relates to the culture in which the ADAIR surname originated. It does not necessarily have any correlation with the language spoken, or religion practised, by the majority of current British residents with that name.
In normal English usage, the word "adair" is a noun.
