Any opinions, observations, or research regarding the son not named after his father when a sibling is?

I have heard theories about how being named after a parent affects a child, but never heard anyone talk about the son not named for his father when the other son is. What do think? Is there any psychological affect? Usually it is the first born son named for his father, and already there are theories on birth order. Some cultures the first born has a very important position in the family, so the other siblings are sort of in the shadows.

My husband is the second born son, but named after his father. He actually looks and acts much more like his father than his brother. I don’t think it has to do with his name, but I wonder how it all affects his brother? I have a friend who is one of four children, 3 boys and 1 girl, and the third born son is named for his father. But, I would guess it is very rare a second or third born son is named after their Dad.