Hello Maddie,
I'm lucky enough to have a lot of Jewish ancestry. Researching this ancestry has been fascinating.
Unfortunately, I can't give you a definitive answer to your question.
Lewis was the common Anglicised form of the Yiddish nickname ליב = Leyb or Leib (German spelling) pronounced libe . This name is the Yiddish word for lion and draws on Jacob's description of his son, Judah (Yehuda), as a lion.
In the early years of the 19th century, many German Jews with the Yiddish name Leib were known as Levi / Levy to the wider non-Jewish population. The best known example was Levi Strauss. BTW, the Hebrew and German forms of the name rhyme with heavy.
Justin