Re: Schoeffe I

>Szulc looks like a raw Polish transliteration of the German
>name Schulz/Schultze etc.

It is only a *modern* orthographic adaptation to Polish writing
rules.

>The Hungarian George Solti's last name seems to be a relative;

But it isn't: his real name was Stern. His father changed it to
Solti. Based on the toponym Solt (today in Croatia) with the
Hungarian place suffix -i (if noble, then -y: cf. Sárközy).

http://en.wikipedia.org/wiki/Solt

Solti's mother's name Rosenbaum.

(I'm not aware of a Hung. word related to Schultheiß/Schulze.)