From: Brian M. Scott Message: 43806 Date: 2006-03-14
At 1:24:09 AM on Tuesday, March 14, 2006, Sean Whalen wrote:
[...]
> Also, I seem to remember gWH > gW and then to g in Irish
> (with rounding of some vowels) and to gw in Welsh.
*g, *gH, and *gWH all become OIr /g/; *gW becomes OIr /b/.
Jackson says that all of this is Common Celtic, at least
initially. The main source of Welsh initial /gw/ is *w.