Lewis is a variant of Llewellyn (Welsh).
Lewis is also a variant spelling of Louis (English and French) in the English language.
See also the related form, Lughaidh (Irish).
Lewis is an all-time favorite. At present it is still rather popular as a baby boy name, but not as much as it was previously. At the height of its usage in 1908, 0.294% of baby boys were given the name Lewis. It had a ranking of #61 then. The baby name has markedly fallen in popularity since then, and it is used only on a modest scale in recent years. In 2018, it ranked at #546 with a usage of 0.026%. Within the family of boy names directly linked to Lewis, Louis was the most regularly used. The name was thrice as popular as Lewis in 2018.
† Pronunciation for Lewis: L as in "lay (L.EY)" ; UW as in "two (T.UW)" ; IH as in "it (IH.T)" ; S as in "see (S.IY)"
Details of famous persons named Lewis:
Author Lewis Carroll, born Charles Lutwidge Dodgson 27 January 1832 - 14 January 1898, Daresbury, Cheshire, England.
Lawyer Lewis "Scooter" Libby, born 22 August 1950, New Haven, Connecticut.
Rock Musician Lou Reed, born Lewis Allen Reed 2 March 1942, Brooklyn, New York.