Cognomen Grzan (Grzan 
) , all over the world, is a rare last name. The surname Grzan is habitual in Slovenia, where it is a rare surname, Croatia, and Germany, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in the United States, Germany, and Slovenia. Also, Grzan is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Grzan | Germany, Croatia, Slovenia, United States, Poland |
| peter grzan German artist, DE (b. 1951) |
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| john-michael grzan college basketball player (2003–2006) Columbia |
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