JavaScript
let names = "sn3cobra,kingtiger1111111,99795659,--depressi0n--,Lydia902,Mega_Hero,TheHolySnake,_Unique-Corn_,coolcreaterXD,sbeN2,AussieAustin011,TheCaptainAsian,cs4359560,2007TwirlingGirl,omi2012,Ethos977,pengmacale_f4f4life,FACEBOOK-MPK-13,scratcherXR,Kitten_Love-123,Cheesy_Folower,chotibandar,0000250903,0000250902,nothing4f,AwesomenessCmR2020,AmyPuppy44,92porsche,supereggie,butterpasta,bendy_and_bacon_soup,ANORDQ2324,underpaw-sans,MimiKitty1,shut_up_noob,CrazedCatLover08,doughnutcrazywalker,StubbyTheCloud223,Scratch_Bertha,bartolomai,samscallion,yuasa01,kaikai0815,lightblue012,grayninja013,Nicole304910,happypanda02,sousummer,Thankyou193sabu,Gameburrito75070,LeprechaunMax,cs4644345,Grelours,drwhoface,bfdifan1002,ksulminas,Echoinq_Silenqe,Happy_mr_cat,-freefollos-,MITTUTHEKING,Islapop123,FreeTheAngel,carloscarmorj,ZaIz6,golden_retrevers,Nebula_Power,HappyKitty8,killo8190,idontcare46,bemyt20,Cupcakebun32,weird_cat147,bboi28,HollowImagination,YammyYameow,Meseker777,jay_ninja111,SilverScreenTheFox,carot3for_me,Lilystar01,thebook-lover,stefanegelja,MAHOMES15_15,Epopo11,goldenfox1800,Minestudios2,ukyoo,KayChiWolf,fubsubdub-jr,cs3576142,Nbeast11,sullyby,finn624,HI0_0BYE,DomDeGea,FastIsaiah,donutcoppa,_Zombie_Dog_,asteadham9744,JustPlayingAGAME,hiearlcar101,-NoobAnimations-,ApocalypseGirl101,5tank,charstar1109,yoriiti999,ruukaa,Make_Others_Famous-2,Arison_AnimeLover,ch25yuic3,creative_456,42022675,S28649234,sakus,sakiaa,potterlife_,Death_246924,blustar2009,MotoMoto9,SEGAStudiosMega,Snoopythebeagle360,Waternas,Friend_Of_A_Furry22,umbreon703,horsegram,msbyellowfrog,Noof5G4,haneef14,banana_split_in_half,3lemons3,88370,mango23000,TinyJazzyFlutist,Starthorn,0opsb0y,monkeyseedoodoo,TateHess23,bogo0102,testuser2045,Dizzly_Bear,KimCakes,Doggy8791,henriqueGP,inventortolu,The_Best_Studio_,Alanas3,Rwer123,MonkeyDV,taku34ori,alovegams_2";
names = names.split(",")
console.log(names.length)
let unique = [...new Set(names)];
console.log(unique.length);