--dhcp-ignore-names[=tag:<tag>[,tag:<tag>]]

When all the given tags appear in the tag set, ignore any hostname provided by the host. Note that, unlike --dhcp-ignore, it is permissible to supply no tags, in which case DHCP-client supplied hostnames are always ignored, and DHCP hosts are added to the DNS using only --dhcp-host configuration in dnsmasq and the contents of /etc/hosts and /etc/ethers.