Family name Cosgrave (Cosgrave 
) , all over the world, is quite a rare surname. The family name Cosgrave is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand, where it is a rare surname. In absolute terms, it most frequently occurs in Ireland, the United Kingdom, and the United States.
| VARIANT | COUNTRY |
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| Cosgrave | Canada, United Kingdom, United States, Ireland, Australia |
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w. t. cosgrave Irish politician (1880-1965), IE (b. 1880) |
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lawrence vincent moore cosgrave Canadian diplomat, CA (b. 1890) |
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| ephraim macdowel cosgrave Irish physician, antiquary and writer (b. 1853) |
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bryan cosgrave Australian rules footballer and cricketer (1903-1992), AU (b. 1903) |
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| john o'hara cosgrave Australian-born US author and editor (1866-1947), US (b. 1866) |
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| marcella cosgrave Nationalist, IE (b. 1868) |
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liam cosgrave Irish politician (1920-2017), IE (b. 1920) |
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| george cosgrave United States federal judge, US (b. 1870) |
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| mary anne cosgrave IE (b. 1863) |
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vera cosgrave Irish public figure (1926–2016), IE (b. 1926) |
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| mary cosgrave local administrator and social worker, IE (b. 1877) |
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| francis herbert cosgrave Irish-born educator and administrator, BE (b. 1880) |
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| philip cosgrave Irish politician (1884-1923), IE (b. 1884) |
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| john o'hara cosgrave American artist, 1908-1968 (b. 1908) |
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| henry alexander cosgrave (1920-1942) (b. 1920) |
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