Being the least creative person I know, I've found some difficulty in coming up with names for the planets and other celestial bodies in the Animorphs series. Throughout the books we only ever hear of the Yeerk, Andalite, Taxxon, and Hork-Bajir home world...as just that: home world. Even when speaking to Ax, Alloran refers to the Andalite planet as the home world. Now, this could mean a few things: K.A Applegate ran out of anagrams to make out of local companies, or human beings are the only species that names its planet.*
So I checked all 51 pages of the classic Animorphs board, didn't see a thread for Planet names--unless I'm so incompetent that I missed it-- and decided I'd make one for us to spitball some names of our own. Of course, lately the forum seem to be pretty empty, so it's likely that I'll be the only one contributing for a while.
*But this wouldn't make sense, because we know the Yeerks have a name for their sun and moon, so why not their planet?