PoppaGator, while what you say is generally true, I sometimes wonder about the self identification of those in Northern Ireland. On top of that, I also suspect the particulars of self identification of people living in the various parts of the British Isles have changed over the last 2-3 generations, which is long enough to capture such changes but still be within the living memory of any family member.

And, although the notions of self identification have been so thoroughly canvassed elsewhere, in other threads, that we don't need to get into such diversions on this thread, I also suspect that parents choose names for their offspring for a huge variety of reasons; self identification (in the "wishing to" as well as "wishing to avoid" senses) will be only one.

Using my daughters' naming process as a personal example, both their mum and myself have single-syllable family names (OK "surnames") and hers is particularly percussive; we wished to avoid given names that might have effectively augmented the percussiveness. We also wished to avoid names that easily became diminutives, those that led to unfortunate combinations of initials and those with initials that might cause confusion on letterrs addressed to them in our household; we weren't too keen on feminised male names either.

Being in Oz, ethnic or other forms of self identification received no conscious consideration at all (though, if the Japanese had won in 1942 I might be writing differently) but I can imagine that, where self identification (in terms of 'allegiance' to a particular subgroup) is taken seriously, it might receive slightly higher prominence when choosing names.

Aliases chosen in adulthood are a different matter.

Cheers, Rowan