Dioxide! You're unforgettable! (And now I have that song stuck in my head)

IS there even an even number of students to pair up? 

Anthony
John
Ben
Jack
Matt
Ryan
COnnor
Kalinda
Austin
Jessica
Estella
Maxine
Katherin
Zack/griffin/arnald
Sue
Devika
Kijani
Chantelle

There is 18 there! if I have them all.