Cognomen Penwell (Penwell 
) , across the world, is quite a rare surname. The surname Penwell is characteristic of the United States, where it is a rare surname, New Zealand, and Canada. In absolute terms, it is the most numerous in the United States, the United Kingdom, and Canada. Very seldom, Penwell is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Penwell | Canada, United Kingdom, United States, South Africa, New Zealand |
| don penwell American basketball player, US (b. 1930) |
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| andrea penwell researcher |
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| bill penwell college basketball player (1954–1954) Oklahoma City |
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| guy penwell American basketball coach, US |
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| john penwell college basketball player (1967–1968) Saint Francis (PA) |
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| john w. penwell American particle physicist |
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