Do I need to put the name on the address if I'm sending to a PO box overseas?

[BethAndHerBrood]

????

Probably better if you do - if the sorters find the number is illegible (e.g. torn label) or incorrect, at least they have the name to work with.

Any particular reason why you wouldn't?

All you need to do (my brother is a postie) as a return address on anything, is put your house number and postcode . This is all the delivery people need.