Surname Demars (Demars 
) , in all the world, is quite a common last name. The last name Demars is habitual in France, where it is quite a rare surname, Belgium, and the United States.
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| Demars | Belgium, France, United States, Canada, Spain |
| jean-odéo demars French organist and composer, FR (b. 1695) |
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| charles demars French organist and composer, FR (b. 1702) |
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| hélène-louise demars French composer, FR (b. 1736) |
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| francis demars (b. 1842) |
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billy demars American baseball player and coach, US (b. 1925) |
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bruce demars United States Navy admiral, US (b. 1935) |
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| suzanne demars FR (b. 1892) |
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| vernon demars American architect, professor (1908–2005), US (b. 1908) |
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| robert a. demars American politician, US (b. 1930) |
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| patrick demars French basketball player, FR (b. 1953) |
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| james demars (b. 1952) |
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| nicole demars Canadian bicycle racer, CA (b. 1970) |
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| jean marc demars (b. 1962) |
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| bob demars director and filmmaker |
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| k. demars researcher ORCID ID = 0000-0003-3306-5372 |
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