Last name Porthan (Porthan 
) , around the globe, is a rare surname. The cognomen Porthan is habitual in Finland, where it is quite a rare surname, and the United States, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Porthan | Finland, United States |
|
henrik gabriel porthan Finnish historian (1739-1804), FI (b. 1739) |
|
| lilli porthan Finnish writer (1874-1967), FI (b. 1874) |
|
|
|
olli porthan Finnish professor, FI (b. 1957) |
|
| martti porthan Finnish organ builder, FI (b. 1952) |
|
|
| kimmo porthan researcher |
|
|
| elviira porthan researcher |
|
|
| sigfrid porthan |
|
|
| aniela von porthan |
|
Mr, Janae, Terri, Nancy, Martti, Samuel, Cheryl, Robert, Donald, Joanna, Laura, Tamara, Edward, Henrik, Viliina, Sheldon, Anthony, Piritta, Gregory, Ginette, Kathleen, Nathan, Catherine, Phila, Brett, Ms, Ed, Amy, Don, Tia, Mary, Kati, Kimi, Rita, Kelli, Greg, John, Jean, Todd, Eric, Erik, Shawn, Sisko, Annie, Caron, Lisa, and Kaisa-Liisa