Last name Costain (Costain 
) , globally, is quite a rare surname. The last name Costain is characteristic of Marshall Islands, where it is a common surname, Isle of Man, where it is quite a common surname, and Canada, where it is quite a rare surname. In absolute terms, it is the most numerous in Canada, the United States, and the United Kingdom. Also, Costain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Costain | Zimbabwe, Canada, United States, United Kingdom, Zambia |
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thomas b. costain Canadian writer (1885-1965), CA (b. 1885) |
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| richard costain Manx businessman, IM (b. 1839) |
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| herbert r. costain American politician, US (b. 1880) |
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| richard costain Costain, Sir Richard Rylandes (1902–1966), building contractor and industrialist (b. 1902) |
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| harold haliday costain (b. 1895) |
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| albert costain British politician (1910-1987), GB (b. 1910) |
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| ed costain American basketball player (1923-2009), US (b. 1923) |
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| meredith costain Australian author, Meredith Contain, has written many lovely children's books over the years. Her books are recommended for ages 4-7, AU (b. 1955) |
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| tom costain Canadian film editor, CA (b. 1971) |
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| deborah a costain researcher ORCID ID = 0000-0002-6187-1411 |
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| kingsley costain college basketball player (2005–2007) Pepperdine |
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| costain muguti Zimbabwean politician |
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| james s. costain Ph.D. The University of Chicago 1997 |
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| gregory costain researcher |
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| alice costain researcher (ORCID 0000-0002-3920-7776) |
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