The girl is a real Sweety Pie
The boy looks so smug and content as if he owns the place.
He is a Lord MountCattan
By the way, he looks like he is going to be a big boy. Magnum or Magnus, maybe????
And if you cannot come up with a name for the girl, why not call her girl in some language or dialect: down under, a girl is a Sheila. Famke is Frisian for girl