First off, "Jehovah" or however it's supposed to be originally pronounced, wasn't an English name to begin with, so English etymological history is irrelevant.
Say my name is John. In English it is John, if I was speaking Spanish, it'd be Juan, in Irish, Sean, in French, Jean.
Get the point?
In the grand scheme of things, Simon is right: this is a petty line of argument and won't win any one over.