https://en.wiktionary.org/wiki/ampersand has the following etymology for "ampersand":

A mondegreen of "and per se and", meaning "and (the character) '&' by itself", which is how the symbol (&) was originally referred to in English. This formulation is due to the fact that in schools, when reciting the alphabet, any letter that could also be used as a word in itself ("A," "I," "O" and, at one point, "&") was preceded by the Latin expression per se (Latin for "by itself"). Also, it was common practice to add at the end of the alphabet the "&" sign, pronounced "and". Thus the end of the recitation would be: "X, Y, Z and per se and." This last phrase was routinely slurred to "ampersand" and the term crept into common English usage by around 1837.

In Swedish, "by itself" is "för sig" that is, quite literally, "per se". (ö and e in "per" pronounced the same, "sig" and "se" pronounced the same.)

This is the most ridiculous thing I ever heard, is it april fools day? I read about "amper's and". Although I have no idea what an amper is, if memory serves the whole thing is related to merchant short hand, but it cannot get any more ridiculous than this joke somebody is having on you.

Sorry but it’s true.

"The last four letters of the alphabet are ecks, why, zee and 'and' as-one/by itself"

You probably meant zed.