Mullaney
An Irish surname most likely meaning “descendant of Mullan,” with Mullan itself often treated as a diminutive or pet form of a personal name.
The #7,803 most common surname in the United States (2010 Census) — about 1 in every 72,800 Americans shares it.
Etymology
The surname is generally explained as an Anglicized form of Irish Ó Mullan(e)y / Ó Muilinni or a related Mullaney form, ultimately tied to the personal name Mullan. In the excerpted scholarship, Harrison specifically treats it as the same name family as Mullan(e)y and glosses it through an old Gaelic personal-name tradition, though the exact inner derivation is not fully secure from the excerpt alone. The name is therefore best understood as a Gaelic patronymic built on a personal name meaning something like a diminutive or familiar form.
History
Mullaney is found in Irish surname groups centered in the north and northwest of Ireland, alongside related forms such as Mullan, Mullany, Mullane, and Mullarkey. In English-language records the spelling has been unstable, so families often appear under several near-identical variants. The surname is common enough in modern Irish diaspora communities, especially in the United States, where it appears in census data but remains relatively uncommon overall.
Origin
Regions
Variant spellings
Fun fact
In 19th-century surname lists, Mullaney was often grouped with a whole cluster of similar Irish names, showing how quickly spellings could shift in recordkeeping.
From the historical record
“(A.-Fr.-Lat.) v. Mullin^. MULLANEY]for 0'Mullan(e)y (Celt.) De- MULLANY > scendant of the Servant or MULANY J Disciple of Mean = Little”
— Surnames of the United Kingdom: a concise etymological dictionary (2 vols in 1)