Peleh Yoetz is probably referring to Hashem. The Meforshim disagree about Sar Shalom. Ish Boshes is one name, and so is Lo Ruchama. You couldn’t call them Ish or Lo, the name was both words; it isn’t two names.
Moshe, Tuvya and Avigdor are three names but they are alternative names. You won’t find him being called Moshe Tuvya ben Amram.
In the Gemara we find that the known names aren’t the original names. Lo Rebbe Meir Shmo Ela Rebbe Nehora’i Shmo. Abaye’s name might have really been Nachmeini, not Abaye.