Everything at my house has a TLD named after the road I live on (a founding father last name). Everything at my offsite at my dads house uses TLD named after the road he lives on (a woman’s first name).
It’s both arbitrary and practical. A number systems exist at both such as proxmox. truenas. pihole. plex. So it’s a good way to tell them appart without having to differentiate them in the domain name.
E-waste