Words that come from Proto-Indo-European “aḱ-”

400 words across 82 languages descend from Proto-Indo-European aḱ- — including eight, ought, October, eighteen, aught, octave, oughtn't, Octavian.

See the etymology of aḱ- itself →

English (147)

Italian (25)

Catalan (23)

Dutch (21)

Latin (19)

Esperanto (18)

French (9)

Ancient Greek (6)

Danish (4)

Asturian (4)

Aragonese (4)

Ladin (4)

Faroese (4)

Czech (4)

Telugu (4)

Swedish (3)

Icelandic (3)

Irish (3)

Sanskrit (3)

Old Swedish (3)

Georgian (3)

Venetian (3)

Greek (3)

Latvian (3)

Proto-Indo-European (2)

West Frisian (2)

Afrikaans (2)

Middle Dutch (2)

Old Dutch (2)

North Frisian (2)

Ido (2)

Tagalog (2)

Welsh (2)

Galician (2)

Slovak (2)

Breton (2)

Armenian (2)

Corsican (2)

Old Irish (2)

Sicilian (2)

Bulgarian (2)

Hungarian (2)

Manx (2)

Japanese (1)

Dutch Low Saxon (1)

Old High German (1)

German Low German (1)

Old Frisian (1)

Cornish (1)

Proto-Celtic (1)

Elfdalian (1)

Yiddish (1)

Slovene (1)

Russian (1)

Translingual (1)

Rohingya (1)

Old Spanish (1)

Old Georgian (1)

Proto-Kartvelian (1)

Friulian (1)

Polish (1)

Romani (1)

Burmese (1)

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Maltese (1)

Proto-Tocharian (1)

Kashubian (1)

Westrobothnian (1)

Crimean Gothic (1)

Macedonian (1)

Hausa (1)

Marshallese (1)

Ukrainian (1)

Luxembourgish (1)

Central Franconian (1)

Gothic (1)

Maori (1)

Dalmatian (1)

Vilamovian (1)

Istriot (1)

Mirandese (1)