Although I prefer [name_m]Louis[/name_m], I still like [name_m]Lewis[/name_m]. And the nickname [name_m]Lew[/name_m] is cute too!
I think the name is a bit dull, in my honest opinion. If you love it, use it! Not my style, but I have nothing against it.
[name_m]Lewis[/name_m] is so underused and amazing. In the naming world such a hidden jem! If you don’t want it to be mistaken for “[name_u]Lou[/name_u]-ee” I’d go with the [name_m]Lewis[/name_m] spelling. [name_m]Louis[/name_m] is also just as great.