How to change your WiFi SSID or WiFi name of your iPhone hotspot
The default SSID for your iPhone hotspot is your name appended with the string: 's iPhone. For example, if your name is John, then the default SSID will be John's iPhone.
What if you do not like the default SSID given to your iPhone hotspot? In this case, read this post to learn how to change your WiFi SSID of your iPhone hotspot.
First, tap on the Settings icon from your iPhone home screen:
Once you are in the Settings screen, tap General
After that tap About:
Next, tap Name:
Finally, type in a new name and click on Done:
Once you had done so, your WiFi SSID of your iPhone hotspot will be changed to the new name.