Glorfindel?

I'm probably way off here, or perhaps this is common knowledge but...

How common is the occurence of 2 elf-lords of equal name? I am sure Glorfindel of Elronds house in the LoTR books needs no further introduction (The Ford of Bruinen etc), but what of the other Glorfindel, of Gondolin who fell from a cliff in battle with a Balrog upon the fall of Gondolin?

The Silmarillion p 293:

"Many are the songs that have been sung of the duel of Glorfindel with the Balrog upon a pinnacle of rock in that high place, and both fell to ruin in the abyss."

and also page 294:

Then Thorondor bore up Glorfindel's body out of the abyss, and they buried him in a mound of stones beside the pass..."