[Mrs. Don-o]

Wikipedia:

Ovaska is a Finnish surname. Notable people with the surname include:

• Asta Ovaska (born 1963), Finnish shot putter
• Jouni Ovaska, Finnish politician
• Toivo Ovaska (1899–1966), Finnish speed skater

[kiryandil]

A quarter of the street signs where I live are Finnish names.

My first guess would have been Finnish [I do genealogy] - second would have been Hungarian/Slav.