That's my thinking. Why does everything have to start with a K? They could just make up a word, like "Garbluns", "Norbulles", "Rigseden" or "Crobblers". Wait, that last one still has a 'k' sound. Or one could just rearrange the word 'Kerbal' into something else: 'Belrak', 'Larkbe', 'Erbkal', 'Rakbel'. These all sound terrible however.