I re-read my response and I sounded a might flippant. So my apologies.

'W' it would appear has been substituted or became a substitute for many letters of the contemporary alphabet. According to G.H. Massey, the ph/f sound was the first consonant and as you're probably aware 'ph' has been transmuted to f, p, v, b, and then or BACK to w.

'W' is also the silent vowel as in SWEOSTER (sister) HWO (who), HWY(why), HWAET (what), in Old English, and might be the explanation for the similarity between Caribbean and ethnic Australian pronunciation. I recall postulating that an explanation for Ofey might be Away and we find Over as Ofer in Old English (Celtic+Gemanic). It was the Germanic tribes who renamed the natives of Britain Wealas (Welch), I think they were originally called Furs or Fors-something, but don't quote me, I have to recheck that name. However the transmutation of 'f' to 'w' and 'l' to 'r' occurs quite commonly, throughout the evolution of language. Another interesting similarity is the name of their god Woden, which is an awful lot like Voodun, the God we honor every third day of the week.