Where does “Foulques” come from?

Foulques (French) comes from Latin fulcus, from Frankish fulk, from Old Norse fólk, from Proto-Germanic fulką, from Proto-Indo-European pleh₁- — to fill.

Ancestry of “Foulques”, step by step

Step	Language	Word	Meaning
1	Latin	fulcus	—
2	Frankish	fulk	—
3	Old Norse	fólk	people
4	Proto-Germanic	fulką	people; tribe
5	Proto-Indo-European	pleh₁-	to fill

Every word from Proto-Indo-European pleh₁- →Every word from Proto-Germanic fulką →Every word from Old Norse fólk →