In Irish it's "Ó hUaine"
ANOTHER ANSWER:
The following names are listed as Irish Gaelic versions of the surname Green(e) in Fr. Woulfe's book of Irish surnames:
de Graoin (of English origin) Limerick, Dublin, Waterford
Ó hUaithne/Ó hUainidhe of W. Cork
Ó hUaithnín of Mayo, Tipperary, Clare
Mac Glasáin/Mac Glaisín of Derry and Louth-Armagh-Monaghan-Fermanagh
Mac Giolla Ghlais of Donegal
Uaithne "some parts of Ireland"
Glas "some parts of Ireland"
Ó hUidhrín in parts of W. Mayo-W. Galway
Ó Fathaigh in some parts of Galway
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Unlike English, the Gaelics have different words for green:
In Irish Gaelic:
uaine = vivid green, verdant
glas = green colour; grey colour
In Scottish Gaelic:
uaine = green
glas = grey-green
In Irish it's "de Grae"
Comment:
The Irish name Mac Giolla Riabhaigh is sometimes anglicised as 'Gray' mainly in Co. Longford.