Where does “fiu” come from?

fiu (Picard) comes from Old French fil, from Latin fīlius, from Old Latin fīlios, from Proto-Indo-European dʰeh₁y-li-os, from Proto-Indo-European dʰeh₁(y)- — to suckle, nurse.

fiu (Picard): son

Definitions

Ancestry of “fiu”, step by step

Step	Language	Word	Meaning
1	Old French	fil	son; thread
2	Latin	fīlius	—
3	Old Latin	fīlios	—
4	Proto-Indo-European	dʰeh₁y-li-os	sucker
5	Proto-Indo-European	dʰeh₁(y)-	to suckle, nurse

Every word from Proto-Indo-European dʰeh₁(y)- →

fiu — Etymology, Origin & Word History | Etymology Explorer