Just use your system browser and rename the file to whatever you want it to be. It has to be the same extension. Then double-click on it and Lightroom will start. This will necessitate the previews file to be rebuilt, but that isn't anything serious. After you have done that, you can go back to starting Lightroom as you normally do.
First backup your current Lightroom Catalog file (has .LRCAT extension) and have a copy in a safe location.
Do what Jim said and also change the previews file and related files with the same basic name and different extensions. See the screen capture, that will save having to recreate the previews and smart previews.
Regards, Denis: System iMac mid-2015, 5K 27” monitor, macOS10.15.6: LrC 9.4, Lr 3.4.1, Ps 21.2.3, Camera OM-D E-M1.