Onnie

Onnie is a charming feminine name with Scottish and Irish roots. Often considered a diminutive of names like Oona (meaning "one" or "unity") or potentially Oonagh from Irish mythology, Onnie has evolved to stand on its own. The name carries a friendly, approachable quality with its soft sounds. Relatively uncommon in contemporary usage, Onnie offers a distinctive choice that remains easy to pronounce and spell. Throughout the 20th century, it occasionally appeared as a nickname for women named Ann or Onnagh, though its usage as a formal given name has been sporadic. The name's simplicity and warmth make it appealing to parents seeking something unconventional yet accessible with Celtic heritage.

Onnie is also given to boys.

Pronounced AHN-ee.

As of November 2026, Onnie ranked #16984 for girls in US births in 2023 and #8179 for boys in US births in 1988 SSA, peaked at #952 for girls in 1898 and #1018 for boys in 1899.