When reading posts very quickly, I tend to confuse doper names, especially ones with the same first letter and roughly the same length. Some of the ones I tend to mix up are (and please, I mean no offense to anyone at all, it’s just the similarity of the names that gets confusing):
Coldfire/Czarcasm/Colibri/Chronos
Feynn/Fenris/Freyr/Ferrous
yojimbo/yojimboguy
jacksen9/jackelope
TV time/TVGuy/TVeblen
Beeblebrox/Zaphod Beeblebrox
Anyone else mix up doper names when they’re reading quickly?
lel / lieu !
Ooh, now i have samarm/samclem too; got your name mixed up on first read! 
jarbabyj/jayjay
Fenris/Ferrous
Astro/Andros
UncleBeer/UncleBill/Ukulele Ike
Kat and I have been mixed up a time or two.
I meant to add Stankow/Stofsky to my list.
spooje and SPOOFE
yojimbo and yojimboguy
spooge/Spoofe,
Elle/elelle/lel
Did I post the OP?
All of the above. 
I knew I was missing a few. I tend to mix up UncleBeer/UncleBill, Kal/Kat, and spooje/SPOOFE myself.
elelle, at first I had people ask me a time or two if I was you, but sadly I’m not! But yes, I think one could possibly even mix up Elle/elelle/lel/lee/ell/lieu. Oh dear!
Phoenix Dragon and Dragon Phoenix.
Arden Ranger and Urban Ranger.
lel, an easy way to tell Kat and myself apart:
If the post is well written, thoughtful, with touches of humour then Kat wrote it.
Badly written, pointless jokes and a touch of simmering bitterness? All mine, baby, all mine!
Back to the OP though: Almost everyone with “Elf” in their username.