In sense Tolbar is real name as Gilbert. Gilbert is his birthname which he rarely uses. He has used most his life name Tolbar so even suggestion spell which would simply ask 'tell me your name?' would result Gilbert introduce himself as Tolbar. But if asked 'tell me your birthname, or name since birth' then it would be Gilbert. It is kind like a true name for outsiders and feys; a name what is their real name but they do not say it out loud.<br/><br/>Also would names really weight and matter that much overall? Name is a cloth of a person. It's up to person what clothes he wears and so is up to person what name he is known for.