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Greetings,
You asked about a 12th-century Finnish male name. We were not able to discover much useful information; here's what we know.
Finnish names were not written down in a systematic fashion until the 14th and 15th centuries, well after Finland was christianized. The best source we know on pre-Christian Finnish names is a Ph.D. dissertation written at the University of Hamburg: 'Die alten ostseefinnischen Personennamen im rahmen eines urfinnischen Namensystems' by D.-E. Stoebke, published in 1964 by Leibniz-Verlag. It's not primarily about pre-Christian Finnish names but about reconstructing the proto-Finnic naming system, but as far as we know there is nothing better available.
Many pre-Christian names survived to Christian times, a few as given names but mostly as bynames. Recognizing the old-style names requires some knowledge of subject.
This letter was researched by Pietari Pentinpoika Uv of the Barony of Aarnimetsa (Finland).
We're sorry that we can't be more helpful, but you have run afoul of the limits of historical knowledge.
In service,
Arval Benicouer
Academy of S. Gabriel