Family name Sooaru (Sooaru 
) , worldwide, is a rare cognomen. The last name Sooaru is habitual in Northern Europe, particularly Estonia, where it is quite a rare surname, Latvia, and Finland, where it is a rare surname. In absolute terms, it is the most numerous in Northern Europe, particularly Estonia, Latvia, and Sweden.
| VARIANT | COUNTRY |
|---|---|
| Sooaru | Sweden, Estonia, Finland, Latvia, Canada |