Last name Gilsenan (Gilsenan 
) , throughout the world, is quite a rare surname. The surname Gilsenan is habitual in Ireland, where it is quite a common surname, the United Kingdom, where it is a rare surname, and Australia. In absolute terms, it most frequently occurs in Ireland, the United Kingdom, and the United States.
| VARIANT | COUNTRY |
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| Gilsenan | United Kingdom, Australia, United States, Israel, Ireland |
| matt gilsenan Irish Gaelic footballer (1915-2013), IE (b. 1915) |
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| michael gilsenan British anthropologist and orientalist (1940-), GB (b. 1940) |
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| alan gilsenan Irish film director and producer, IE (b. 1962) |
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| selina gilsenan Australian netball player, AU (b. 1978) |
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| alicia gilsenan researcher |
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| betty gilsenan recipient of a New Zealand Suffrage Medal 1993, NZ |
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| mary b gilsenan researcher ORCID ID = 0000-0002-9584-4999 |
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| michael gilsenan Swiss composer, CH |
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| carol gilsenan researcher (ORCID 0000-0002-6054-1461) |
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| conor gilsenan Irish rugby union player, IE (b. 1992) |
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| zak gilsenan irish-Australian association footballer |
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