Family name Coplen (Coplen 
) , in the world, is quite a rare surname. The last name Coplen is habitual in the United States, where it is a rare surname, Ireland, and New Zealand. Measured by absolute frequency, it is the most numerous in the United States, Canada, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| Coplen | United Kingdom, Ireland, Canada, New Zealand, United States |
| tyler b. coplen physicist |
|