Kearney
Kearney Matthew Zzyzwicz, Sr. is one of the school bullies of Springfield Elementary, hanging around with Nelson Muntz, Dolph Starbeam, Jimbo Jones, and the Weasels. He is of Polish descent and is a fifth grader. A running gag is that Kearney is much older than all of the other kids at Springfield Elementary School but has been held back from graduating for many years.
Kearney's surname was revealed in a computer file in the 399th episode "24 Minutes".