Can 徐 develop a sound mo1?

Question

徐 has initial 邪, which I don't immediate see the connection with [m]. 徐 has rhyme 鱼, which mostly developed into u(ü) and a. I cannot think of how the mo1 sound can be developed.

徐 is 形声字 (Phono-semantic), 从彳余声. 余 has multiple readings, one of them has initial 定 (https://zi.tools/zi/%E4%BD%99) in 集韻. The Vietnamese initial of 徐 is t.

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BACKGROUND

I read somewhere that the first character of mo1so1 (Sichuan Mandarin, usually written as 摸索/摩梭) is originally（本字） 徐, which means slow. The meaning makes sense, and the whole word is 偏正 and roughly means slow, or more accurately 磨叽，磨蹭.

Answer 1

the standard is xú, and I don't even see any other alternate pronunciations listed in the dictionary-- there is always rooms for error, but generally even uncommon/outdated alternate pronunciations are listed if recognized. Therefore I would believe that if there is an alternate pronunciation based on a mo sound in sochuan area it is likely not mandarin based. perhaps it entered sichuan mandarin from a different language-- assuming it isn't sichuanese itself, as its important to note that sichuanese is a distinct language from standard mandarin: the same way portuguese and spanish are distinct languages while in the same family.

Also on a possible note, could it be that the character originally being 徐 does not mean it was originally pronounced mō? I could be missing information not in your post but I don't see why the older character version of the vocab would have the same pronunciation. It would make more sense to be different.

If it helps, both of the characters you listed as current ways to write it are mo in standard mandarin as well (with varying tones).