What country does the name Lewis come from?

Answer 1

Germany.

The original name was Chlodovic, meaning "famous warrior". It gradually morphed to Hlodovic to Lodovicto Ludwig. In France it was shortened to Lovic, which was transcribed by Latin clerks as Louis. When the name crossed the channel, the English spelt it Lewis.

Answer 2

Wales.

In this case, it means "son of Llewellyn". The name Llewellyn is derived from Lugubelinos, from the Welsh deities Lugus (the messenger-god) and Belerus (god of light).