It's believed the 'pound' in pound sterling came from a pound of silver or silver coins in weight originally as well.
But confusing the name of the two slashes (how come?) has the exact opposite effect, so I don't like it.
Or are you saying 'hash-tag' is the name because although it's a mistake it's used so much now it's considered language?
Language isn't one big blob, even though among many people it could now be considered an alternative pronunciation, and eventually it could be adopted even in places where people would otherwise know better, right now among people in tech and certainly on this site 'hash-tag' to mean the character is incorrect and confusing.
There are many valid names and usages for this symbol: https://en.wikipedia.org/wiki/Number_sign#Names_of_the_chara...