Cognomen St-Cyr (St-Cyr 
) , around the globe, is quite a rare last name. The surname St-Cyr is habitual in Canada, where it is quite a rare surname, Haiti, and New Zealand. Much less frequently, St-Cyr is the forename as well as the last name. Parts of the name also exists independently as a first name Cyr.
| VARIANT | COUNTRY |
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| St-Cyr | Haiti, Canada, France, New Zealand, United States |
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lana st-cyr CA (b. 1927) |
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thierry st-cyr Canadian politician, CA (b. 1977) |
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| hugo st-cyr Canadian actor, CA (b. 1978) |
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| fannie st-cyr performing artist in Canada |
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| guillaume st-cyr performing artist in Canada |
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| lucie st-cyr performing artist in Canada |
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| james st-cyr association football player, HT |
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| amik st-cyr Ph.D. Université de Montréal 2002 |
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| élie st-cyr performing artist in Canada |
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| daniel j st-cyr biochemistry researcher |
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| jérémie st-cyr performing artist in Canada |
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| claude st-cyr |
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| sc vue creationa st-cyr |
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