Langan Families from N. E. County Mayo
The name Langan is a contraction and Anglicisation of the Irish (Gaelic) name, Ó Longáin, meaning grandson (or descendant) of Longáin.  Longáin is thought to mean long or tall. 

According the local Ballycastle lore, six Langan brothers arrived from Donegal in the 18th century and settled in Doonfeeny and the Ballycastle area.  The six Langan brothers are credited with building the picturesque Palmerstown bridge about 1788, which was subsequently used by General Humbert's invading French troops that came to assist the Irish rebellion in 1798.  Langan was a relatively common name in County Mayo by the time of the Griffiths Valuation (c1850), with 77 families recorded.  The author's Langan ancestors come from Ross, Ballyknock (Townland), in Doonfeeny parish. 
Thomas McDonnell
Bourke
Patt Langan
Thomas (Tom) Langan
  Langan
Households  by
County in 1864


Clare         1
Cork          3
Donegal      30
Dublin       26
Dublin city  13
Galway       12
Kerry        12
Kildare      10
Laois         1
Leitrim       3
Limerick      5
Longford     16
Mayo         77
Meath        38
Offaly        3
Roscommon     7
Sligo        17
Tipperary     1
Waterford     9
Westmeath    20
                            How common is the Surname?

The following lists indicate how common each of the above surnames was by county during the 1848-1864 Griffiths Valuation.  If the surname is very rare, then you can be more certain that a name which matches your ancestor's is more likely to be the correct person.  If the name is common, then you may need more details to verify the match.  This information is available for most surnames at the Irish Times web site.
  Sweeney
Households  by
County in 1864


Antrim        1
Armagh        3
Belfast city  2
Carlow        3
Clare        16
Cork        138
Cork city     7
Derry        12
Donegal     145
Down          7
Dublin        6
Dublin city   7
Fermanagh     9
Galway       24
Kerry        48
Kildare       3
Kilkenny      6
Laois         7
Leitrim      30
Limerick     10
Longford      3
Louth         7
Mayo         33
Meath        12
Offaly        6
Roscommon    12
Sligo        16
Tipperary    28
Tyrone       11
Waterford    17
Westmeath     7
Wexford       4
McDonnell
Households   by
County  in 1864


Antrim       180
Armagh       124
Belfast city  68
Carlow       104
Cavan        180
Clare         91
Cork         138
Cork city     34
Derry         58
Donegal       38
Down         133
Dublin       125
Dublin city  101
Fermanagh    102
Galway        94
Kerry         56
Kildare       88
Kilkenny     165
Laois        120
Leitrim       19
Limerick      56
Limerick city 24
Longford      41
Louth        184
Mayo         389
Meath         84
Monaghan     163
Offaly        53
Roscommon    151
Sligo         67
Tipperary     99
Tyrone       144
Waterford     44
Westmeath     41
Wexford      109
Wicklow       92
  Tomas
Households  by
County in 1864


Mayo         10
  Connor
Households  by
County in 1864


Antrim        89
Armagh        43
Belfast city  42
Carlow        39
Cavan         31
Clare         66
Cork         688
Cork city     76
Derry        152
Donegal       55
Down          85
Dublin       178
Dublin city   77
Fermanagh     27
Galway       335
Kerry       1252
Kildare      115
Kilkenny      13
Laois        138
Leitrim       49
Limerick      92
Limerick city 17
Longford      64
Louth         96
Mayo         231
Meath         84
Monaghan      51
Offaly       130
Roscommon    217
Sligo         93
Tipperary    156
Tyrone        46
Waterford     70
Westmeath    100
Wexford      310
Wicklow       69
  Bourke
Households  by
County in 1864


Antrim         4
Armagh         1
Carlow         6
Cavan          5
Clare         34
Cork         130
Cork city     12
Derry          4
Donegal       12
Down           4
Dublin        13
Dublin city   14
Galway       119
Kerry         27
Kildare       18
Kilkenny      48
Laois         27
Leitrim        1
Limerick      51
Limerick city 21
Longford       4
Louth          1
Mayo         150
Meath         11
Monaghan      14
Offaly        13
Roscommon      6
Sligo          4
Tipperary    224
Tyrone         2
Waterford     25
Westmeath      8
Wexford        2
Wicklow       13
  Lavelle
Households  by
County in 1864


Antrim       2
Armagh      12
Belfast city 1
Down         1
Dublin city  1
Fermanagh    5
Galway       2
Kilkenny     1
Leitrim      1
Louth        1
Mayo       286
Monaghan     8
Roscommon    1
Sligo        5
Tyrone       1
  Collins
Households  by
County in 1864


Antrim        30
Armagh        71
Belfast city  52
Carlow         6
Cavan         32
Clare        157
Cork        1014
Cork city     63
Derry         53
Donegal       58
Down          77
Dublin       105
Dublin city   43
Fermanagh     49
Galway       195
Kerry        172
Kildare       16
Kilkenny      27
Laois         22
Leitrim        3
Limerick     285
Limerick city 18
Longford       5
Louth         45
Mayo          50
Meath         32
Monaghan      30
Offaly        36
Roscommon     44
Sligo         10
Tipperary    125
Tyrone        54
Waterford     57
Westmeath     17
Wexford       11
Wicklow       25
John Connor
The picturesque Palmerstown Bridge near Killala,
built by the six Langan brothers
Langan Y-DNA Results
A descendant of Patt Langan c1800 submitted a DNA test in February 2011 and the results are posted at the Langan Y-DNA results at the Langan surname Y-DNA project.  The haplogroup is estimated as R1b1a2, the Atlantic modal (Gaelic) haplogroup.  This haplogroup includes the M269 SNP and was previously known as R1b1b2 under the older phylogenetic nomenclature.  The majority of close matches in the DNA database are from Ireland, confirming Gaelic ancestry.
Famous Langans associated with County Mayo
The Irish full-forward Gaelic footballer Tom Langan (1921-1974) was born and raised in Ballymacue (Ballycastle), County Mayo.  Ronan O'Gara the Irish Rugby star and record points scorer, is Tom Langan's first-cousin-twice-removed, and is also descended from the County Mayo Langans.  Both are descended from the common ancestor, Patt Langan c1800, whose descendant chart is shown below.

Ancestry of "The Great Tom Langan" (Gaelic footballer) 
Langan Households by County in 1864                                        
Clare         1   Cork          3   Donegal      30   Dublin       26   Dublin city  13
Galway       12   Kerry        12   Kildare      10   Laois         1   Leitrim       3
Limerick      5   Longford     16   Mayo         77   Meath        38   Offaly        3
Roscommon     7   Sligo        17   Tipperary     1   Waterford     9   Westmeath    20
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Langan families:
Click here for Descendants of Patt Langan c1800   (Ross, Ballyknock, Doonfeeny, Co. Mayo)
Click here for Descendants of Anthony Langan c1820 - c1805   (Killerduff, Doonfeeny, co. Mayo)
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