It's weird that when I first updated to Yosemite the wifi disconnects came a little more frequently. Often enough that I usually couldn't get through a large Time Machine backup without it being interrupted. After a while if became less frequent and eventually stopped happening. Not sure if it was fixed in one of the minor updates or just stopped on its own.
This happened to me. I did the same thing. Went into Sharing and deleted the appended number. Happened a couple of times then stopped happening. Not sure what caused it but it didn't seem to be much of an inconvenience. Aside from seeing the number appended to the machine name in Finder it never seemed to affect the functionality of it. Just a cosmetic issue.
Same issue here. I've tried to manually rename under "Sharing" - it only worked for a while, then (x) appeared again.
Any fix? Downloading 10.10.1 as of right now.
This happened to me. I did the same thing. Went into Sharing and deleted the appended number. Happened a couple of times then stopped happening. Not sure what caused it but it didn't seem to be much of an inconvenience. Aside from seeing the number appended to the machine name in Finder it never seemed to affect the functionality of it. Just a cosmetic issue.