No, I think Bear had it right. At least, that's how I figured it was done. And his theory makes sense, too. I think Visser Three was created in an artificial pool with his sibling(s), but I could be wrong.
I had my own theory that I believed to be solid, but was foiled by a few Yeerks. For the most part, the Yeerks that we were introduced to in the series had about six letters in their names--Esplin, Edriss, etc. The way I see it, if you split the Yeerks name into three parts--for example, Esplin 9466-- you may just get the first two letters of a Yeerk parent's name--ES PL IN. Unfortunately, we get Yeerks with names like Eslin, Ordet and Temrash, which pretty much pokes a hole in my little theory.