Dw i wedi dysgu -
Gofyn i rywun am rywbeth
I have learnt
Ask to someone for something
In the booklet Pa Arddodiad gan D Geraint Lewis
gofyn am rywbeth
gofyn rhywbeth gan rywun
gofyn i rywun gwneud rhywbeth
gofyn i rywun am rywbeth
gofyn dros rywun
There is no mention of gofyn wrth. I thought wrth was specific to just a few vebs such as dweud wrth rywun.