Origin
Conn : 1: Scottish and Irish (Armagh Derry): back-formation from Mac Coinn ‘son of Conn’ the early Gaelic personal name usually interpreted as ‘reason wisdom’ or ‘head chieftain’; its genitive in surnames is Coinn[e] see Quinn.2: Irish: shortened form of McConn.
Connell : 1: Irish: shortened form of O'Connell or McConnell.2: Manx: from Gaelic Mac Giolla Chonaill ‘son of Giolla Chonaill’ a personal name meaning ‘servant (i.e. devotee) of Saint Conall’. Compare O'Connell. The surname has sometimes been confused with Cannell.
Connor : Irish and Manx: shortened form of O'Connor which is an Anglicized form of Gaelic Ó Conchobhair ‘descendant of Conchobhar’.
Cunningham : 1: Scottish: habitational name from the province of Cunningham in Ayrshire first recorded in 1153 in the form Cunegan a Celtic name of uncertain origin. The spellings in -ham first recorded in 1180 and in -ynghame first recorded in 1227 represent a gradual assimilation to the English placename element -ingham.2: Irish: surname adopted from Gaelic Ó Cuinneagáin ‘descendant of Cuinneagán’ a personal name from a double diminutive of the Old Irish personal name Conn meaning ‘leader chief’. This name is also adopted for Ó Connacháin a variant of Ó Connagáin ‘descendant of Connagán’ from a diminutive of the personal name Conn.
Guinan : Irish (Offaly Tipperary and Kilkenny): shortened Anglicized form of two distinct Gaelic names which have now become confused: Ó Cuinneáin ‘descendant of Cuinneán’ a personal name from a diminutive of conn ‘chief’ and Ó Cuineáin ‘descendant of Cuineán’ a personal name from a diminutive of cana ‘whelp’.
McConnell : Irish (northern) and Scottish (southwestern): Anglicized form of Gaelic Mac Dhomhnaill ‘son of Domhnall’ from the lenited pronunciation of the name. See McDonald. O'Connell is from a different personal name. Compare McConnon.
McManus : Irish and Scottish: Anglicized form of Gaelic Mac Maghnuis or Mac Maghnusa a patronymic from Maghnus later Mánus a Gaelic form of the Scandinavian personal name Magnus made famous by St. Magnus of Orkney. As an Irish name this is found mainly in Roscommon and Fermanagh and is connected with the O'Connors or the Maguires; in Scotland it is connected with the Colquhouns.
Naugher : Irish (Ulster): shortened Anglicized form of Gaelic Mac Conchobhair ‘son of Conchobhar’ (see O'Connor). This form seems to have arisen from a common pronunciation of the personal name as Cnochúr with loss of the initial k- in the process of Anglicization.
O'Connel : from Ó Conaill see O'Connell.
O'Conner : Irish: variant of O'Connor.
O'Connors : from Ó Conchobhair see O'Connor.
O'Conor : Irish: variant of O'Connor.
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Source : DAFN2 : Dictionary of American Family Names 2nd edition, ©2022 by Patrick Hanks and Oxford University Press
FANBI : The Oxford Dictionary if Family Names in Britain and Ireland, ©2016, University of the West of England
FNI : The Oxford Dictionary of Family Names of Ireland, ©2021 Kay Muhr and Liam Ó hAisibéil
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