Monaghan
An Irish surname that most likely began as a form of the Gaelic word for “monk,” or as a name linked to County Monaghan.
The #4,452 most common surname in the United States (2010 Census) — about 1 in every 38,748 Americans shares it.
Etymology
The surname is usually explained from Irish Gaelic manach, meaning “monk,” with a diminutive or surname-forming ending giving the sense of “little monk” or “descendant of the monk.” Some 19th- and early 20th-century writers also connected it with the place-name Monaghan in Ireland, so the name may in some families be locational as well as Gaelic in origin. In practice, both explanations appear in the historical literature, with the Gaelic derivation generally treated as the stronger one.
History
The name is well attested in Irish surname scholarship and appears in records under spellings such as Monachan, Monahan, Monighan, and Monigan. Early-20th-century Irish genealogists grouped it with other forms related to Monahan/Monehan, and English-language surname books sometimes mention a possible link to County Monaghan. Today it remains a distinctly Irish surname, especially associated with Ireland and the Irish diaspora.
Origin
Regions
Variant spellings
Fun fact
A few older surname dictionaries treated Monaghan and Monahan as closely related or even overlapping forms, which is why the name can appear under several spellings in historical records.
From the historical record
“MONACHAN ] (Celt.) Monk [Ir. and Gael, MONAGHAN \manach, a monk + the dim. MONAHAN J suff. -dn\ MONCKTON (Eng.) Bel. to Monckton, Monk- ton = the Monk's or Monks' Farm or Estate [O.E. munuc, a monk ; tiin, farm, &c.] Monkton, Kent occurs as Munccetun in a Latin charter of A.D. 961. Monkton, Durham, belonged to the…”
— Surnames of the United Kingdom: a concise etymological dictionary (2 vols in 1)