Separate names with a comma.
Because that's just how they do it!......I'm gonna go shower off the puns now...
Because they're English words and English is a renegade language that doesn't play by the rules.
nike is the greek goddess of victory, so I suppose that's more or less how the word is pronounced in greek
Kinda like the question of why house and houses but not mouse and mouses.
cuz english rules!!1