how to name variables in stata

hey all,

suppose i have two variables v1 and v2. i name the variables using

label variable v1 "x"
label variable v2 "y"

NOW supposed i create duplicate variables m1 and m2 using

gen m1=v1
gen m2=v2

how can i also duplicate the variable names automatically so m1 and m2 would now also be labeled "x" and "y".