My Terminal hostname suddenly changed to an AirPlay device name

As already noted, this "Samsung" is not your mac hostname.

It is appearing there due to how your shell prompt was customized.

What is the output of the following command in Terminal:

echo $PROMPT

Have you already tried to set it manually 'sudo scutil --set HostName MacBook-Pro-di-Giuliano'

flushed dns cache: 'dscacheutil -flushcache' and rebooted?

giulianoaiello wrote:

Afterwards, if I log into some new Terminal tabs the hostname is "Samsung.station" again (although this `hostname` command should set permanently the hostname)...

If you using a VPN try disabling it, and compare your results.

primary hostname of the Mac:

sudo scutil --set HostName <new host name>

Bonjour hostname of your Mac (local network):

sudo scutil --set LocalHostName <new host name>

change the computer name (computer name you see in finder):

sudo scutil --set ComputerName <new name>

dscacheutil -flushcache

restart Mac

I would force all three (or at least Hostname and LocalHostName) with 'MacBook-Pro-di-Giuliano'

giulianoaiello wrote:

Spent days on this then suddenly find out the source, but I still can't address the problem.

On Terminal, my hostname is "Samsung". Despite this has never happened before (it always has been showed up as MacBook-Pro-di-Giuliano) and I do not know why it happened now, I think that it is because I have both my MacBook Pro and a Samsung TV connected to the same WiFi. In fact, when I connect my Mac to a different network as my iPhone router, the Terminal hostname is "correct" (MacBook-Pro-di-Giuliano).

you can customize your zsh prompt...

https://www.makeuseof.com/customize-zsh-prompt-macos-terminal/

A clarification is in order: %m in the prompt does NOT represent the host name, but the computer model.

Of course, your computer model is not "Samsung", but at least we can direct our attention away from the hostname, which is irrelevant to the present issue.

Please disregard my previous post.