Where does “*babō” come from?

*babō (Proto-West Germanic) comes from Proto-Germanic bō-, from Proto-Indo-European bʰā- — to say.

Ancestry of “*babō”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	bō-	A stem meaning "father, brother, close male...
2	Proto-Indo-European	bʰā-	to say