Olli Jalonen, 1954 Helsinki, is a Finnish writer and recipient of the J. H. Erkko Award in 1978 for his debut novel Unien tausta, and the Eino Leino Prize in 1990.
Olli Määttä is an amazing hockey player with a awesome name to go with him.
― Anonymous User 8/3/2015
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I think it would be more accurate to say that this is a diminutive of Olavi, since that form of the name is more common in Finland than Olaf. [noted -ed]