Cognomen St-Gelais (St-Gelais 
) , around the world, is quite a rare last name. The family name St-Gelais is habitual in Canada, where it is quite a rare surname, New Zealand, and France, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Canada, New Zealand, and the United States. Parts of the name also exists independently as a first name Gelais.
| VARIANT | COUNTRY |
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| St-Gelais | France, United States, New Zealand, Canada |
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marianne st-gelais Canadian short-track speed skater, CA (b. 1990) |
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| thérèse st-gelais CA (b. 1955) |
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| fred st-gelais Canadian musician, CA (b. 1974) |
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| philippe st-gelais Canadian cinematographer |
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| nicolas fortin st-gelais researcher |
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| alexis st-gelais researcher |
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| roxane st-gelais performing artist in Canada |
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| raphael st-gelais researcher |
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