Where does “fillo” come from?
fillo (Galician) comes from Old Portuguese filho, from Latin fīlius, from Old Latin fīlios, from Proto-Indo-European dʰeh₁y-li-os, from Proto-Indo-European dʰeh₁(y)- — to suckle, nurse.
fillo (Galician): son; children; scion
Ancestry of “fillo”, step by step