"xX" is short for "courtland" a gospel rap artist from Louisiana.
xX is a minister of the gospel of Christ Jesus The Lord.
x = Christ
X = everlasting
also: in Mathematics the variable "X" is an unknown number
(who knows how many people/nations truly inhabit the body of Christ)... jus' something to wonder about.
in my own words:"x" also relates to mE as giving God all the glory and never seeking credit for anything He has done.