Family name Outwater (Outwater 
) , in the world, is a rare cognomen. The surname Outwater is habitual in the United States, where it is a very rare surname, Canada, and Brazil, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Outwater | Brazil, United States, Canada |
| john outwater American Revolutionary War captain, US (b. 1746) |
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valentine charles outwater American cattle barge captain (1882-1960), US (b. 1879) |
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james franklin outwater US (b. 1913) |
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| edwin outwater American conductor, US (b. 1971) |
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| gerald h. outwater musher |
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| catherine outwater wife of Edward M. Sawyer Sr., US |
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