Lakka uses Avahi to publish its hostname on its local network. By default, a system running Lakka is accessible as lakka.local within your local network without explicitly knowing its IP address. (It is also accessible as simply lakka via Samba.)
However, if you have multiple machines running Lakka, setting a unique hostname for each will avoid name collisions.
Using the command line interface:
echo "picard" > /storage/.cache/hostname
Upon rebooting, the system will be accessible as picard.local within your local network. (The Samba name will be simply picard.)