Family name Westmaas (Westmaas 
) , around the world, is a rare last name. The surname Westmaas is habitual in Suriname, where it is quite a rare surname, Netherlands, and New Zealand, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Netherlands, the United States, and Suriname.
| VARIANT | COUNTRY |
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| Westmaas | United Kingdom, Netherlands, Canada, United States, Suriname |
| f. de roo van westmaas (b. 1780) |
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| arie westmaas (b. 1904) |
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| leonard westmaas Guyanese cricketer (1923-2011), GY (b. 1923) |
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| jan westmaas Dutch politician, NL (b. 1953) |
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| johann westmaas researcher |
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| conrad westmaas British actor |
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| jonathan westmaas association football player, TT (b. 1981) |
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| stephen westmaas SR (b. 1971) |
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