Spanish ser

← Proto-Indo-European *sed- (derived)

← Proto-Indo-European *h₁ésti (inherited)

← Proto-Italic *sedēō (inherited)

← Proto-Italic *ezom (inherited)

← Latin sedeō (inherited)

← Latin sum (inherited)

← Old Spanish seer (inherited)

→ Spanish era (mention)

→ Spanish listo (mention)

→ Spanish sé (mention)

→ Spanish fuiste (mention)

→ Spanish enseres (prefix)

→ Spanish eseyente (mention)

→ Interlingua esser (derived)