Asturian y, Portuguese e, Galician e, Catalan i, French et, Italian e, Aromanian e, Romanian e, Sardinian e
Umbrian et 'id.,' Paelignian et 'id.'
Gaulish eti "yet," Old Breton et- 'id.'
Gothic iþ "but"
Ancient Greek ἔτι (hépi) "still,
Sanskrit áti "beyond," Avestan aiti 'id.'
Following de Vaan (2014), in Proto-Indo-European and later, the word meant "furthermore" to coordinate an additional phrase onto a previous statement while the language used the suffix *-kwe (Latin -que; not in Spanish). Eventually the *-h1et overshadowed and finally replaced the suffix.