Origin of the Gilmartin name
Woulfe: 'the name of an Ulster family who were anciently chiefs of Cinel Fearadhaigh. In the 16th century, it was common in Monaghan, Sligo and Roscommon, and was also found in many other parts of Ireland.'[1]
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Irish surname
Mac Giolla Mhártain · 'son of Giolla Mhártain' (servant of St. Martin)
Woulfe (1923) gives Gilmartin as an anglicised form of Mac Giolla Mhártain, 'son of Giolla Mhártain' (servant of St. Martin), the name of an Ulster family who were anciently chiefs of Cinel Fearadhaigh. He says that in the 16th century it was common in Monaghan, Sligo and Roscommon. Matheson's 1890 index has 24 Gilmartin and 22 Kilmartin birth entries.

Woulfe: 'the name of an Ulster family who were anciently chiefs of Cinel Fearadhaigh. In the 16th century, it was common in Monaghan, Sligo and Roscommon, and was also found in many other parts of Ireland.'[1]
Kilmartin · Guilmartin · M'Gilmartin · M'Gillamartin[1][4][3]

The design shown is a coat of arms associated with the Gilmartin surname. In Irish and British heraldry a coat of arms is granted to one person and passes to their heirs; it does not belong to everyone who shares the surname. Many families still use the arms of their name as a symbol of their heritage.
Woulfe gives it as a form of Mac Giolla Mhártain, 'son of Giolla Mhártain' (servant of St. Martin).[1]
Woulfe says it is the name of an Ulster family who were anciently chiefs of Cinel Fearadhaigh, and that in the 16th century it was common in Monaghan, Sligo and Roscommon.[1]
Woulfe prints Kilmartin among the forms of Mac Giolla Mhártain, and Matheson's 1901 list cross-refers Kilmartin and Gilmartin; his 1890 index counts them separately (24 Gilmartin, 22 Kilmartin).[1][4][2][3]
Woulfe lists Martin among the forms and says the name 'is, no doubt, in many instances now disguised under the anglicised form of Martin'.[1]
Note: Matheson's 1890 figures for a surname include its spelling varieties (Matheson, Table Explanation).
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