Things to help identify devices on your network - Start with the guide on the Samba Wiki
option host-name is very handy
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Samba hostname host-name over-ride
Change dhcp-<IP ADDRESS>
If you want the updated DNS to reflect the hostnames you set in your dhcpd.conf use host-decl-name in your on commit statement
set ClientName = pick-first-value( ucase(host-decl-name), option local-host-name, option host-name, config-option-host-name, client-name, noname);