Family name Port-Louis (Port-Louis 
) , across the world, is a rare cognomen. The last name Port-Louis is habitual in Seychelles, where it is a common surname, Australia, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Parts of the name also exists independently as a last name Port, and a first name Louis.
| VARIANT | COUNTRY |
|---|---|
| Port-Louis | Australia, Seychelles, Canada, United Kingdom, United States |