Ghange Device Name

Heloo ..

last Active was about ayear Ago =D

any way ..

i had a problem while am in my new company .. that they are not allowing my to use WIFI .. but i managed to get passwords from a friend there .. but here is the problem :

if i connect to wifi .. That IT Man Will Figer out i am using wifi cause iam the only one who have moto G looool
and he already did and i thought if i change my device name he will never know .
any whay i have moto G 2nd gen and i had lolipop stock rooted .. and i managed to go throw the build.prop and i managed to change device name and every thing ., ( restart ) >> Obbbbba ! .. still every thing same .. build prop edited but phone still have same name and when i connect to PC Still Giving XT1068 ..

So .. what is just happend .. and why my phone wont change name ! .. any idea cause i need to change that in @ least on the network ..

Peace ! ..