I mean it’s not hard to understand, every word in English that ends in ‘some’ is spelled that way. Gruesome, twosome, loathsome, handsome… I can’t think of a single one that drops the e, so why would people who may have only ever heard his name spoken know that it’s spelled differently? Even people that have seen it written, their mind probably just fills in the pattern recognition from all the other words they’re used to spelling.