Kev, that falls under the famous "the only rule for names is, there are no rules" rule.

I'll give ya an example: an old lady who worked for me at the newspaper in Nebr. had a last name of Tvrs. T-V-R-S, not a vowel in it.

I thought it was the call letters of the local teeveee station.

It was pronounced "Tavv-riss".

Apparently, when the dumb Norwegians Swedes and Polocks traveled across the Great Plains to settle western Nebraska, all of their vowels fell out of the wagons. Being hardy make-do pioneers, they cobbled new names together out of what was left.