Well, the passuk talks about Yehuda buying stuff which is normally not thought of as appropriate to purchase. So that is a similarity with pidyon haben where you buy a child, which is not normally thought of as appropriate to purchase.
My real advice: Talk about something else. It is weird to try to connect the name to the concept of pidyon haben. Your name does not have to connect to every life event. I sure hope you didn’t name another kid Avraham so that you would have something to talk about at the bris.