I am aware of the existence of alternate spellings of names, believe it or not, and also of the existence of mandolins, hence my statement "alternate spellings of word names are silly." Because Elizabeth and Elisabeth are both accepted spellings of the name, but you could not refer to the instrument as a mandalyn. There is, in fact, a correct spelling of the word mandolin and so if you spell it another way, yes, it gives the impression that you do not know how to spell it. Obviously I know you know how to spell the mandolin because you also spelled it correctly in your post, this is a hypothetical, if I saw the name Mandalyn in use. It's not personal, I just think it's a stupid name that I hope no child would ever have to bear, an opinion I have the right to just as much as you do yours.
(But what do you mean by "spellings aren't a binary" anyway? What's the binary here? Correctly spelled and incorrectly spelled? Because when it comes to words I am in fact a great proponent of standardized spellings.)
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https://www.behindthename.com/pnl/120652