I'd go along with that - you can't argue with the dictionary (well, you can, but you've got to have your shit together in quite a big way!). The p/f sound change thing is well recognised, by the way - its called Grimm's Law, after Jakob Grimm (of brothers Grimm fame), who first noticed this phenomenon. It covers the sound change from "b" to "v", too - evident in the name/pronunciation of (the allegedly unpronouncable) Cnoc Fillibhear Bheag. I can't remember properly but it may also include "d" to "th".
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