Portuguese céu

← Catalan cel (cognate)

← Spanish cielo (cognate)

← French ciel (cognate)

← Galician ceo (cognate)

← Proto-Indo-European (inherited)

← Proto-Indo-European *keh₂i- (mention)

← Italian cielo (cognate)

← Proto-Italic *kailom (inherited)

← Latin caelum (inherited)

← Occitan cèl (cognate)

← Romanian cer (cognate)

← Old Portuguese ceo (inherited)

→ Galician ceo (cognate)

→ Kabuverdianu seu (derived)

→ Guinea-Bissau Creole seu (derived)