Answer by rogerdpack for OS X computer name not matching what shows on terminal

As mentioned in a separate answer, another option is to override the default PS1 prompt, like executing the following line (or adding it to your ~/.bash_profile file):

 $ PS1="$(scutil --get ComputerName):\W \u\\$ "

refs:

https://superuser.com/a/414903/39364

http://www.cnet.com/news/keep-your-command-prompt-host-name-static-in-os-x-and-other-unix-systems/