Leopold, NN
Poldi: I would use
Leo and not
Poldi.
Poldi sounds comical to me, but it might be okay where you live.
Lysander: It's growing on me, but I can't help but picture an arrogant, pompous sort of person when I hear it.
Samson: Cute and underused. I don't think of the Bible story, I just think it sounds neat.
Willoughby wolloughby willina, an elephant sat on Billina.
Willoughby wolloughby wirfak, an elephant sat on Mirfak.