Wikipedia also says it’s Lewis. Andrew Lewis was a significant figure in Virginia in the Revolutionary and pre-Revolutionary periods. He died of illness just as the Revolutionary War was ending. (Just learned this; I’d never heard of him before!)
Harper’s illustration shows Lee’s name, but photos show each statue with the name cast upon its base, not shown on the stone of the monument, which shows only WASHINGTON.
It looks as though Harper’s has some inaccurate into.
Fake news!