Cognomen Louwenaar (Louwenaar 
) , all over the world, is a very rare family name. The surname Louwenaar is characteristic of Netherlands, where it is a rare surname, Canada, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Louwenaar | United States, Netherlands, Canada |