DHCP, BIND and NetBIOS Name working together

Hi all...

I have a FreeBSD server running and serving address to the LAN using
DHCP, the clients are windows2000 but the netBIOS name of each client
have to set up Manually like (PC01,PC02 etc but the name is not
relative to the ip address)
by example
the name PC01 - have the address 192.168.1.30
the name PC02 - have the address 192.168.1.38 and so on...

I know that this is because the DCHP is giving the address
dynamically, but I like to know if exist some manner of make that the
NetBios Name be relative to the ip address, some like that.

192.168.1.1 - PC01
192.168.1.2 - PC02
192.168.1.3 - PC03

or only setting the ip and netbios name manually for each client...

Regards...