All around the world, Casteel (Casteel 
) is a very rare unisex given name. Much more frequently, Casteel is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Casteel | Netherlands, Philippines, Canada, United States, Germany |
| miles w. casteel American football player and coach (1895–1977), US (b. 1895) |
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| carter casteel American educator, lawyer and politician, US (b. 1942) |
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| wynne casteel college basketball player (1952–1954) Missouri |
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| carri casteel researcher |
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