Where does “filina” come from?
filina (Esperanto) comes from Esperanto filino, from Esperanto filo, from Latin fīlius, from Old Latin fīlios, from Proto-Indo-European dʰeh₁y-li-os, from Proto-Indo-European dʰeh₁(y)- — to suckle, nurse.
filina (Esperanto): filial
Ancestry of “filina”, step by step