man i feel ya. I go out almost every night of the week and I just can't keep up with the amount of people I meet. Names to me are likes numbers, in through on ear, out through the other. Usually if I cant remember someones name I'll introduce my buddy into the set and the girls repeat their names and I try to pay attention to it after I feel like its worth my time. example:

you talk to a girl for 10/20 minutes and dont remember her name. She is with a group of 3 or 4 other girls, u wanna get a girl alone. bring in your wingman.
me: hey ladies this is my buddy John, he is a good friend of mine
group: hey John, my name is.....,......,...... so on and so on.

if a exchange numbers with a girl and don't remember her name i'll make her put it in my phone and if she asks why i didn't do it, i neg her about it, telling her that if she wants her number in my phone, she needs to put it in herself.... never fails. hope this helps.

Use their name a few times in conversation right after they tell it to you - it will help you remember. The fact she asked if you even remembered her name - tells me she was onto something else - maybe she could tell you were running game?

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duck
I got to get into this dude's pelt and crawl around for a few days. Who's the gopher's ally? His friends. The harmless squirrel and the friendly rabbit.

i learned this in my freshman year orientation in college years back, some of the upperclassman were talking about how its difficult to remember so many new names...but bassically its still great advice.

He suggested everytime you meet someone you think of something awful. For example. 'Jessica' in your head call her 'JabberingJessica'...or anything really stupid and mean and it'll stick.

W/e stands out about that person that you would make fun of use that in a nickname when meeting them. (Just don't refer to them w/ that outloud lol)