Re: hispanic name?
>he's celtic in a region that doesn't vote for celts....
The history of immigration to the border region isn't just "whites north, others south". A lot of Europeans moved to northern Mexico (the 'banda' music that you find in the western border area is derived from German 'oompah' polka style introduced by immigrants from Germany, for example).
So its quite possible that an O'Rourke could have been Mexican.
Incidentally, one of the major Indian nations that straddles the border in Arizona is called the Tohono O'odham. I don't think they're from Ireland, though.