Where does “*togyā” come from?

*togyā (Proto-Celtic) comes from Proto-Indo-European (s)teg- — to cover; pole, stick, beam.

Ancestry of “*togyā”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	(s)teg-	to cover; pole, stick, beam

*togyā — Etymology, Origin & Word History | Etymology Explorer