When you change the clip names in the bin they live in, they will change in the sequence as well.
If you are only concerned with the clips in the sequence and not the others, you can go to “set bin display” > “show reference clips” and it will now list all the clips in the sequence along with the sequence. You can rename them here, or option + drag them into another bin and then you can keep them in a bin and rename them there. I would copy them into another bin so that you have a bin with the clip names saved. Then you can put the sequence bin back to not show reference clips and if the names ever revert, just open the new bin with the renamed clips in it to change them back. (Unless you already have them in a bin and are changing the name there.)
I would open all bins with sequences when you rename any clips as sometimes they hold the data and will overwrite the names back to the camera file names when opened. At least this used to happen, don’t know if it was ever ‘fixed’.