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Spanish word hijo comes from Proto-Indo-European *dʰeh₁(y)-, Latin fenum, and later Old Latin filios (Son.)
*dʰeh₁(y)- (Proto-Indo-European)
to suck, to suck, suckle
fenum (Latin)
*dʰeh₁y-li-os (Proto-Indo-European)
sucker
*dʰeh₁ylios (Proto-Indo-European)
filios (Latin)
filios (Old Latin)
Son.
*feiljos (Proto-Italic)
Son.
fīlius, fīlios (Old Latin)
filius (Latin)
(by extension) any male descendant. (in the plural) children. A son.
figlia (Italian)
(usually, regional) girl. Daughter.
fijo (Old Spanish)
Son.
hijo (Spanish)
Child (when the gender of the child is unknown). Son.