The 'sunshine' meaning you were told as a child is one of several mistaken meanings of 'Helen' names (I was always told that my middle name, Ellen, the Scottish form of Helen, means 'light'). The suggested meanings of Helen here include 'torch' and 'moon' which may be where these misconceptions come from.
The information in this site is well-researched and you can be fairly certain that it is correct. Sorry!
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