Unless you are Barack Obama and you are named Barack H. Obama II.
People think the II is just a fancy way of indicating Jr. It's not. Maybe Obama's parents (whoever they were) thought II sounded more distinguished than Jr. They obviously were misinformed.
The II is reserved for naming a child after someone who is not the father. It was useful when many of an extended family lived in one house. A child might be named after a grandfather or an uncle and the II was appended to his name to identify the younger person.
It’s even worse when it gets into III, IV or V. Yikes! C’mon folks, use some imagination!
Re your post 76, thanks for pointing that out. Most people assume that Jr. and II are interchangeable.