Kanic said:
I'm not familiar with the language at all so I'm not one to speak really, but from looking arround the internet I saw that the Espada's releases had names that could be translated both ways depenind on the writing:
Pantera: Panther in Spanish, Panther King in japanese (in the way it was written)
Murcielago: Blacked-Winged Demon in japanese, sth with death and bats in spanish
Arrogante, Ira and all the rest were the same. And that fact really amazed me cuz some names portrayed both the form of the release and the behaviour of the correspondant Espada. So if the same is true for Bach's name I would like to know.
You said that Bach means river (more or less) in german so now I ask if the way it was written means anything in japanese. Thanks for the effort btwI took a look at wikia, it looks like the Kanji was written next to the attacks you've mentioned. However, the Kanji of the characters with foreign names (written in Katakana in other words) are not mentioned, so the only meaning we can get is from the pronunciation or from the foreign words themselves.
I looked Juha up, the only definition I could find is from Finnish, it's a boy's name that means "God is Gracious", and the German version of it is Johann..