Family name Castonguay (Castonguay 
) , in the world, is quite a common surname. The last name Castonguay is characteristic of Canada, where it is quite a common surname, New Zealand, where it is quite a rare surname, and the United States, where it is a rare surname.
| VARIANT | COUNTRY |
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| Castonguay | Canada, United States, New Zealand, China, France |
| théodore castonguay Canadian photographer, CA (b. 1831) |
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| joseph-alexandre castonguay Canadian photographer, CA (b. 1877) |
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claude castonguay Canadian politician, CA (b. 1929) |
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| antoine castonguay Canadian politician, CA (b. 1881) |
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| philippe castonguay politician, CA (b. 1913) |
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martin castonguay CA (b. 1953) |
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| jacques castonguay (born 1926), CA (b. 1926) |
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| édouard castonguay Canadian musician and composer (1929-2006), CA (b. 1929) |
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| marie-france castonguay-thibaudeau Canadian nurse, CA (b. 1931) |
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| gérard castonguay Canadian painter, CA (b. 1933) |
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| eustache castonguay CA (b. 1925) |
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éric castonguay Canadian ice hockey player, CA (b. 1987) |
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| charles castonguay Canadian mathematician, CA (b. 1940) |
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| jeannot castonguay Canadian politician, CA (b. 1944) |
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| lise castonguay Canadian actor, CA (b. 1953) |
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