Resolved Odd network printer issue - wrong name

I am trying to set up three identical Samsung printers on our school network by IP address. One has accepted the name I have given it - ScienceLab1, however, he other two appear on the network as Sec followed by a series of numbers not as History1 RE1 as I set them through static IP address allocation. Is there a convention I should be following that somehow I have missed on these two?

 

Thanks Tony,

I'm using the printers built-in software. Plugging it via a LAN cable and turning it on. Printing out the IP setting it's picking up then using that to create a static IP address. From there I have the problem - it's fine if I set up as a local printer with that static IP address and can name during the local set up but to allow wider network access to the printer is something I haven't worked out how yet - hence the question.

 

Thanks Tony. We have three identical Samsung ML-371x Series. With your help the issue is now resolved. Oddly in DHCP clicking on the entry initially didn't allow entry to properties but by double clicking it I got there eventually!