1. German feminine form of Wilhelm, the German form of William, from Old German "helmet of resolution" or "helmet of desire".
2. Scottish. Wilhelmina, like its Scottish variant Williamina, is far from rare in the 1841 Census of Aberdeenshire, with nearly 20 spelling variations, all very rare. To find these, it is recommended that Soundex searching for both Wilhelmina and Williamina should be used.