
Spanish word hija comes from Proto-Indo-European *dʰeh₁-m̥n-eh₂, and later Old Latin filios (Son.)
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*dʰeh₁-m̥n-eh₂ (Proto-Indo-European)
who sucks
*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.
fija (Old Spanish)
Daughter.
hija (Spanish)
Daughter;.