The oldest kid is the youngest kids' neighbor.
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His name is Chris.
Do you mean the orange hoodie? His name is Kenny McCormick.
Ike, Kyle's younger brother is Canadian and thus posessed of a two part head according to South Park law.
S11E14 The list
I think the only kid's name that was revealed was Jamal, the kid who wanted to burn down the school. The rest are just named for their appearances.