You will have to specify "change the name". There are two names that you would want to chance. The first and most common is the network name or SSID. Options to change this name are found under the MiFis admin page. you can access this page with various shortcuts depending on the model but the most consistent technique is to enter the IP address of your MiFi into a webbrowser. In most cases this IP address will be 192.168.1.1 but there are ways to look up and confirm that information.
The other name worth mentioning is the hostname, or the device name of your MiFi on its network. Most people do not care about hostnames since they are primarily for advanced administration of the MiFi and its network. But if you want to modify this value it should be available under the same admin window as mentioned above.
For more specific steps please mention your Jetpack model and the OS on your personal device.