Rigby: Why the Germanic Drummers on Pajamas' Summer of Lust?

I have seen many reviews of Summer of Lust over the years. This, a first. Paul Rigby, The Audiophile Man notes: “Only the part-time drummers, Karl Wilhelm and Joe Bauer, keep shtumn. Be nice to know why this band’s drummers tend to have Germanic names, though. Must update the Blog on that point.” And the Answer is?