Puny

Puny comes from the French puis né, meaning born afterwards. It was originally therefore meant to mean junior. That's why, in a British court, all but the most senior judge are called puisne judges; and, yes, puisne is pronounced in exactly the same way as puny.

So all younger children are punies. As a middle child I'm not quite sure how to take this.

A puny can also mean an absolute beginner, hence the line in Middleton*'s Revenger's Tragedy:

I see thou art but a puny in the subtle mystery of a woman.

I wish girls would stop saying that to me.

The Inky Fool hires himself out to commuters

*Or Tourneur