Baum
The German surname suffix -Baum is popular among spooks, so it may again be a pun. One possibility is the Semitic compound בעם b-ˁm b-am, which can mean “among the people” or “with a veil”.
The German surname suffixes Stein, Berg, Mann, Feld all pun with “veil” or “disguise”, that’s why they are so popular with spook aristocrats. It should be possible that the common German surname suffix Baum is also a pun, since it’s also very popular with spooks. However, there seems to be no word in the ancient languages with those consonants that means “veil” or “disguise”.
However, there is the Semitic compound b-ˁm which can mean “among the people” or “with a veil”, pointing to a hidden ruler living among the people with a veil:
Since Semitic rozen means “ruler”, the very common spook name Rosen-Baum could then mean “ruler among the people”, i.e. living secretly among the people.
Note: The root ˁm in the meaning of “veil” is very rare and the general sense of “dimming” & “darkening” seems to have dropped out of use. The expression b-ˁm or similar ones meaning “among the people” are very common in the Talmud though, so that one is the more likely pun.