it does not sound stupid!! :) he has so many so many names (some of them are more like titles than names IMO)
ólorin (meaning dreamer/vision) - his original name in valinor… before he came to middle-earth
mithrandir (grey pilgrim) - to elves, dúnedain and people of gondor… and my fave name :)
grey pilgrim / wanderer - A common translation of mithrandir
tharkûn (grey-man/ staff-man) - to dwarves
white rider - after his return ans usually is referred like that when he is with shadowfax
greyhame - more ppl from rohan that use this name
stormcrow - to king théoden (again rohan)
láthspell (bc his news were bad) - again rohan (they dont like gandalf v much asjdksjakja) given by gríma
and last but not least gandalf (wand-elf or something like that) - most used/known name
there are other names like Old Greybeard…Icánus but they are not v known or not v used…i think..i dont remember :T