Wilmer
[ˈwɪlmər]Meaning
from the Old English Wilmǣr, willa "will, desire" + mǣre "famous"
Background Story
Wilmer comes from the Old English name Wilmǣr, formed from willa, meaning mind, will, determination, purpose, desire or wish, and mǣre, meaning famous. It reached English use likely by way of a surname derived from that name, and in some cases it is regarded as a masculine form of Wilma. The name is also used in Brazilian Portuguese, and a Dutch cognate is recorded.

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Willi
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Willie
Diminutive of William, from Will + -ie
Willma
No documented meaning in the sources checked
Wolter
Dutch variant form of Walter
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Russian form of the greek Aléxios, meaning "defender"
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Diminutive of Bernard, Bernadette, Bernice and other names beginning with Bern