Surname Lilleaas (Lilleaas 
) , worldwide, is a rare family name. The cognomen Lilleaas is habitual in Norway, where it is quite a rare surname, Finland, where it is a very rare surname, and Spain. Much less frequently, Lilleaas is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Lilleaas | Finland, Norway, Spain, United States |
| ulla-britt lilleaas Norwegian sociologist (b. 1944) |
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| cathrine riis lilleaas host (b. 1976) |
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| inga ibsdotter lilleaas Norwegian actor (b. 1989) |
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