Proto-Indo-Aryan *Háykas

→ Bhojpuri एगो (inherited)

→ Gujarati એક (inherited)

→ Hindi एक (inherited)

→ Konkani एक (inherited)

→ Maithili एक (inherited)

→ Marathi एक (inherited)

→ Nepali एक (inherited)

→ Oriya ଏକ (derived)

→ Punjabi ਇੱਕ (inherited)

→ Punjabi اک (inherited)

→ Sanskrit एक (inherited)

→ Sinhalese එක (inherited)