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One of those strange things that happens in movies is that you need someone to actually say people's names, or else you have no idea who those kids are. This was a way for her to introduce who the important boys were in the story, but then it just was so funny that it became a centerpiece to it. When you look at the character design that Tim did for Weird Girl, and what Catherine [O'Hara] did with the voice, and it's gonna kill.

Source: collider.com
One of those strange things that happens in movies is that you need someone to actually say people's names, or else you have no idea who those kids are. This was a way for her to introduce who the important boys were in