Worldwide, Seijen (Seijen 
) is an extremely rare male forename. Predominantly, Seijen is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Seijen | India, Spain, Netherlands, United States |
| melis van seijen Frisian publisher, bookseller and music producer, NL (b. 1926) |
|
|
| wobbe van seijen Frisian shop owner and music producer, NL (b. 1947) |
|
S J, Ellen, Femke, Ineke, Martin, Moniek, Melisa, Michel, Timmy, Desley, Joshua, Nicole, Hellen, Wesley, Wolter, Yvonne, Sjoukje, Gerard, Jelle, Jerry, Janou, Jan, J H, H H, Mick, Anne, Remy, Guus, Leon, Joey, Elly, Eloy, Harm, Henk, Marjo, Siebe, Peter, Donny, Barbara, and Patrick