In the Management server List by default contains both Name and IP address..you can confirm it by either editing Management server list ( MSL) or Opening sylink.xml in notepad.
If both are listed then no need to worry just rename and reboot the server.
However if both are not listed over there then Add a new MSL where add both the Names and IP address and assign it to all the groups.
This will be propogated to Sylink.xml on all the clients then you can rename your SEPM server without doing anything.