It doesn't matter how many of them end in "uis", maybe it's not even Lithuanian - I don't know, ask Phil's dad. But Rudzevecuis is a name, it gets 25,400 hits, and there are loads of people out there with that name. Yeah, Rudzevicius is also a name, and it's about 50% more common than Rudzevecuis. But "Phil Rudzevicius" and "Phillip Rudzevicius" get zero hits - that's the point. "Phil Rudzevecius" gets 1 hit, and "Phillip Rudzevecius" gets zero. "Phil Rudzevecuis" and "Phillip Rudzevecuis" get 179 and 140 respectively, with loads of decent sources for Rudd. I imagine Rudzevecuis and Rudzevicius are variations on the same name - like Davis and Davies, for example. He's even credited as "Phil Rudzevecuis" in the CD booklet for Buster Brown's Something to Say. If you can find a good source for "Phil Rudzevicius", we can put it in, but until then, we can't.