Where does “bobo” come from?

bobo (Bikol Central) comes from Spanish bobo, from Latin balbus, from Proto-Indo-European balb-.

Ancestry of “bobo”, step by step

Step	Language	Word	Meaning
1	Spanish	bobo	stupid, silly, naive; A stupid or naive person; a...
2	Latin	balbus	stammering, stuttering; lisping; fumbling
3	Proto-Indo-European	balb-	—