The American climbing scale originally went 1-2-3-4 then 5 with decimal point additions eg 5.6 or 5.9 with 5.10 being the highest (it is currently 5.15a I think). The company initially made rock shoes before branching out. So five-ten definitely.
Schwalbe is easy. Tis the German word for Swallow (as in the bird) and thus entirely phonetic. So Schwal – rhymes with “shall”, and “be” like the 1st part of Ben