How do I Change the Name of My MacBook and Why was it Changed after the Upgrade to Yosemite?

Hi everyone,
I upgraded my MacBook Air (2012) to Yosemite a few months back and it changed the name of my Mac from "Alan's MacBook" to "Alan MacBook Air (2)." I simply want to know how to change it back to the original name. Also, why was it changed in the first place after my upgrade to Yosemite?
Thank you so much!!!
Alan

Professor AR wrote:
Also, why was it changed in the first place after my upgrade to Yosemite?
This was a common bug in Yosemite. Follow dwb's instructions but also restart your router. Make sure you're running OS X 10.10.2 since it was supposed to have been addressed with that update.
I have heard allegations regarding simultaneous use of both Wi-Fi and Ethernet (or equivalent adapter, considering it's a MBA) but can find no justification for them, and I never personally observed any correlation to it. It's perfectly acceptable to use both.

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