[ 2 syll. le-xy, lex-y ] The baby boy name Lexy is also used as a girl name. It is pronounced as L EH KS-iy- †. The origin of Lexy is Old Greek. Lexy is a variant of the name Alexis (English, Greek, French, and German). Lexy is rarely used as a baby name for boys.It is not listed in the top 1000 names. Among the group of boy names directly linked to Lexy, Alexis was the most regularly used in 2012.t is pronounced as L EH KS-iy- †. The origin of Lexy is Old Greek. Lexy is a variant of the name Alexis (English, Greek, French, and German). Lexy is rarely used as a baby name for boys.