Here are nicknames that have been given to more than one person :)
Thanks, Enjoy, Comment :)
Chandler & Joey = Braclet Buddies
Chandler & Joey = Lazy Boys
Chandler & Joey = Fancy Lads
Chandler & Joey = Roomies
Chandler & Joey = J Man and Channy's
Chandler & Ross = Weenies
Joey, Rachel & Phoebe = Children
Chandler & Monica = Love Birds
Chandler & Monica = Blahh
Chandler & Monica = The Bings
Ross & Joey = Ball Boys
Ross & Joey = The New Joey and Chandler
Ross & Rachel = Dr. and Mrs. Geller
Ross & Rachel = The Geller's
Ross & Rachel = Lobsters
Phoebe & Rachel = Losers
Ross, Joey & Chandler = The Three Hockeyteers
Ross, Joey & Chandler = Hairy Backed Marries
Joey, Rachel, Phoebe & Ross = Little Elves
Monica, Rachel & Joey = Kids
Thanks, Enjoy, Comment :)
Chandler & Joey = Braclet Buddies
Chandler & Joey = Lazy Boys
Chandler & Joey = Fancy Lads
Chandler & Joey = Roomies
Chandler & Joey = J Man and Channy's
Chandler & Ross = Weenies
Joey, Rachel & Phoebe = Children
Chandler & Monica = Love Birds
Chandler & Monica = Blahh
Chandler & Monica = The Bings
Ross & Joey = Ball Boys
Ross & Joey = The New Joey and Chandler
Ross & Rachel = Dr. and Mrs. Geller
Ross & Rachel = The Geller's
Ross & Rachel = Lobsters
Phoebe & Rachel = Losers
Ross, Joey & Chandler = The Three Hockeyteers
Ross, Joey & Chandler = Hairy Backed Marries
Joey, Rachel, Phoebe & Ross = Little Elves
Monica, Rachel & Joey = Kids

mistake...
Monica Geller isn't the one who is in the hearts of many, here are some reasons for it:
1-she's a control freak
2-she wanted to waste Chandler's life savings on her wedding dream
3-it's either her way or no way
4-she dated Rachel's ex (which Rachel wasn't fine with it)
5-she was ready to sell Chandler down the river because she didn't want to "lose" to Rachel and Phoebe
6-when Chandler wanted to let the dog go, she sneaked it back in, when Chandler wanted to keep the duck and the chicken she said she had "allergies"
1-she's a control freak
2-she wanted to waste Chandler's life savings on her wedding dream
3-it's either her way or no way
4-she dated Rachel's ex (which Rachel wasn't fine with it)
5-she was ready to sell Chandler down the river because she didn't want to "lose" to Rachel and Phoebe
6-when Chandler wanted to let the dog go, she sneaked it back in, when Chandler wanted to keep the duck and the chicken she said she had "allergies"