Surname ラッシュ (Rash 
, Rush , Lush 
, among others...) , worldwide, is a widespread cognomen. The cognomen ラッシュ is characteristic of Liechtenstein, where it is quite a common surname, Grenada, and Belize (explore the name in all countries). In absolute terms, it is commonest in the United States, Germany, and Iraq. Much less frequently, ラッシュ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Rash, Rush | Germany, United Kingdom, United States, India, Iraq |
| Lush | Germany, United Kingdom, United States, India, Brazil |
| ラッシュ | Japan |
| Rusch | Germany, Indonesia, United Kingdom, United States, Brazil |
| Lasch, Rasch | Germany, United Kingdom, Australia, United States, Brazil |