Gog is a nickname used by Welsh-speakers from the south of Wales to refer to someone from the north of Wales. It's a shortening of the word gogleddwr (northerner).
It means Clychau'r Gog
clychau'r gog; croeso haf
What's a "gog"?!
'Gog' is a Biblical personage.
'You' is not a Welsh word.
Gog - comics - was created in 1998.
GOG Svendborg was created in 2005.
In the Bible, Gog was written about in Ezekiel 38-39.
It doesn't mean anything in Welsh; it's in English.
Gog - Marvel Comics - was created in 1971.
It's not a word in Welsh.
Do you mean 'What is the Welsh for witchcraft?' That is 'dewiniaeth'.