Cognomen St-Arnaud (St-Arnaud 
) , worldwide, is a rare surname. The surname St-Arnaud is habitual in Canada, where it is quite a rare surname, New Zealand, where it is a rare surname, and France, where it is an extremely rare surname. In absolute terms, the name is most common in Canada, New Zealand, and the United States. Parts of the name also exists independently as a first name Arnaud.
| VARIANT | COUNTRY |
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| St-Arnaud | Chile, Canada, United States, New Zealand, France |
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yves st-arnaud Canadian psychologist (1938-), CA (b. 1938) |
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bertrand st-arnaud Canadian politician, CA (b. 1958) |
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| pierre st-arnaud sociologist and professor at Université Laval, CA (b. 1941) |
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| louise st-arnaud university professor, CA (b. 1958) |
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| rené st-arnaud researcher (ORCID 0000-0003-1016-1580) |
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| marc st-arnaud researcher, CA |
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| catherine st-arnaud performing artist in Canada |
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| claire st-arnaud Member of Montreal City Council, CA |
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| charles st-arnaud researcher (ORCID 0000-0001-7257-8491) |
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| karine st-arnaud work in the theatrical field, CA |
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| guy-robert st-arnaud researcher |
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| liliane st-arnaud performing artist in Canada, CA |
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| simon st-arnaud |
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