Quote Originally Posted by rinku
Bui is katakana for "buoy"... possibly something to do with floating? Looks like a float tube around its neck... perhaps Flotter?

Neither Perappu nor Buizeru seem to sound like parrot (oumu) or otter (rakko, kawauso), but I'm only going by my Japanese e-dictionary - I'm not really fluent.
I think Buizeru sounds more like weasel, myself. Could see it being called Bouysel. Or maybe Vweasel, because of the shape of its tail. However, I could also see problems between its name and Sneasel if it gets translated like that.

Also, could Perappu be a subtle reference to Parappa the Rapper?