Family name Leasen (Leasen 
) , in the entire world, is a very rare cognomen. The surname Leasen is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, Leasen is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Leasen | Philippines, United States, South Africa, Thailand |