What is ironic about the scene with Urk and Miriam?

Urk drags Meriam forward, declaring he will have her instead of Elfine. Mrs. Beetle pipes up, implying that Meriam's children are his. She tells her daughter not to take him unless she wants to, and Meriam decides she does. Urk tries to pick her up and it is only with a great deal of effort that he manages the feat and barrels out the door with her. The irony of this is that Urk's name and behavior suggests a big, strong oaf, and so it is a bit comical when Urk tries to pick up Miriam and barely manages the feat.