Pi hole shows the actual hostname or IP of the client making the query
Most queries show as coming from
vodafone.broadband (my router's hostname), except two laptops which show their hostname
Edit: I also have this in the log, maybe it's related?
Jun 30 22:02:23 dnsmasq-dhcp: no address range available for DHCPv6 request via wlan0
Further edit: i disabled ipv6 as I don't think my ISP's router supports it (Vodafone UK).
For example, I have a tp-link access point that I know is continuously pinging tp-link.com, but pihole shows the query still coming from the router