another homonimous... elendil, father of isuildur, and tar-elendil, who was four generations below elros tar-minyatar. anarion was the younger son of elendil, and tar-anarion was the eight king of numenor.
also, although i've mentioned it elsewhere on this board, i had kinda forgotten about it, heh. grond is both the mace of morgoth and the battering ram of sauron. also, gothmog is both the lieutenant of morgoth, and the lord of the balrogs in the silmarillian. in the lord of the rings, gothmog is the lieutenant of sauron. there are of course other, more obvious hominomous, such as dark lord, dark years, and whatever.
and if we ignore the history of middle earth series, the glorifendal who slew gothmog bears the same name as the glorifendal who was in LotR.
finally, looking in the robert foster's the complete guide to middle earth...
there was aragorn, arahad, arathorn, argeleb, arveleg, atanatar, barahir, bard, belecthor, beleg, beregond, beren, boromir, calimehtar, calmacil, etc.