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ゟ is a digraph that is read より. Where does it originate from?
Is it a ligature, like & <- et, or German ß <- ſs -> ss? (Wikipedia claims this, citing no source.) Also, if it is a ligature, what did the ligation process look like (e.g. what are the intermediate forms between より and ゟ)?
Alternatively, could it be a derivative of 与 or another kanji? (Another non-authoritative source which I have now lost track of claims this.)
There are quite a few old (17th century) letters on this page which use the digraph ゟ as ligature of よ and り. For example see the fifth line from the left of the following letter, which reads 「家来之者方ゟ可申」.
As @ZhenLin points out, it is not too far a stretch of your imagination that ゟ comes from joining よ and り in vertical writing. All that is really lost is the loop of the よ.
