Ok I have literally no reason to make this but:

Steven totally named Lion Lion because almost everyone he knows has names that describes who they are or what they do.

First of all, the gems are an obvious one. But then you get to the Townies. The Frymans sell fries. The Pizzas sell pizzas. Mr Smiley smiles all the time. How is this kid supposed to grow up in this environment and not think it totally normal to just use a general descriptor of the thing to name it?

Lion makes total sense as a name to him.

Ok have a nice day