Changing the name of device
How do you change the name of a device on an account?
iPhone 6 Plus, iOS 11
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Apple is introducing a new Apple Watch Pride Edition Braided Solo Loop, matching watch face, and dynamic iOS and iPadOS wallpapers as a way to champion global movements to protect and advance equality for LGBTQ+ communities. Learn more >
How do you change the name of a device on an account?
iPhone 6 Plus, iOS 11
I presume you are referring to name of iPhone.
Simply go to Settings > General > About > Name
Wait for 10 - 15 mins for it to get refreshed or restart the device (Wathc the GIF)
Change the name of your iPhone, iPad, or iPod - Apple Support
Changing the name of device