This band name has two major flaws.
1) Ambiguous pronounciation. It's supposed to be pronounced "see say," but one might pronounce it "sissy" or "seese."
2) An asterisk. This renders it nearly unsearchable. Try searching for it on Amazon. OK, never mind, I've done that for you. There are different listings under "Si Se," "Si-Se," "Si*Se (with an accent aigu over the e, which I can't figure out how to do here)," and "Si*Se."
Si*Se are one of my favorite downbeat artists, but guys, you need to do something about your band name.