I can’t prove causality, I could prove correlation, but frankly it isn’t worth the effort to gather and interpret all the necessary data. If you’re interested, I’d encourage you to test the correlation that I suggest.

If I were to string together an anecdotal argument for causality, however, it would be a sense of threatened white identity. The linkages between this belief and Republican political affiliation are well-documented. To extend this to the significant trend and spatial distribution in names your data shows (1.5% is significant from a possible sample of 000s of names), I would contend that this is a form of ‘defensive’ cultural consolidation of rural whites who feel threatened by national shifts in ethnic composition, share of college-educated adults, and economic growth heavily favoring metropolitan areas.

It’s a way of saying ‘we’re different, we’re not like them’