Leopold was Mozart's somewhat famous (composer/musician/author) father. Anton Mozart was a German painter and draughtsman, and lived before either. So, there is no connection that i know of, unless the latter two were in some way related.

Anton Stadler was a clarinettist in Mozart's time. He dedicated Clarinet Concerto in A for Stadler. The original composition was written to a special clarinet that could play lower notes than the modern clarinet in Bb.

Anton Voster is 6' 2 1/2".

Dene Anton is 5' 2".

I believe his name was Anton Stadler.