Hello! My name is Elle, and only have three kiddos for you, all of the female variety.
Dominque Weasley and Rachel Baddock (raddock) are both 7th years, Slytherin and Ravenclaw respectively. Dom would know him on account of they're in the same house, but she's rather lazy when it comes to socializing with those outside of her year/family, so I don't know how much they'd interact. Rachel likely wouldn't know him either.
I also have Shannon Creevey (creeved), a 6th year Gryffindor and the loudmouth blurb. She's a beater for the Gryff team, so I'd imagine they'd have some pretty intense rivalry going on there!