This is already available 
Requirement: You made sure that the device will always get the same IP address (add a static lease in DHCP server).
Then, add this device with the name you like in /etc/hosts on your Pi-hole, e.g.,
192.168.2.125 android-cell
either wait until the next full hour (once an hour client host names are updated internally) or restart pihole-FTL and voilà :
or
