Kaiser is way to title-y for me. To boot it's the name of a kind of roll. This one definitely has too many other strong associations for me to like it as a name.
I'm not big on Kase, either. It looks like an informally abbreviated form of Kasey to me. Plus--Nirvanna already pointed this out, I see!--it's just shy of being the German word for cheese (der Käse). German's a pretty popular languate to study around here, and a kid wouldn't get through high school without people making that unflattering connection.
www.qwantz.com