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The name neighbors see is the SSID. The password is a different field. Change one and the other stays put.
A router broadcasts a name. Phones list that name when they look for WiFi. That name is the SSID. The password is what you type after you pick the network. The WiFi name generator only suggests the name.
A plain ASCII name can be 32 characters. Spaces count. Letters, numbers, apostrophes, hyphens, and normal punctuation are the safe set. Emoji and unusual symbols are a common reason a router rejects the save or a phone shows garbage.
Two paths work on most home networks. Use the one that matches the box you have.
You need to be joined to that network, or plugged into the router with a cable, before the admin page will load. The admin password is not the WiFi password, even when a sticker prints both.
Find Wireless, WiFi, or WLAN. The field is often called Network name, SSID, or WiFi name. Paste the name, then save or apply. Leave the password field alone if you only wanted a new name.
Some routers keep two names, one for 2.4 GHz and one for 5 GHz. If both are listed, change both when you want a single name in the phone list. If you like them split, name them on purpose so people can tell which is which.
A guest network is a second SSID. Changing the main name does not rename the guest network. Open that section if guests use a different name.
Devices that were connected drop off, because the old name is gone. Join the new name and type the same password, unless you changed that too. A smart TV, a printer, and a doorbell often need the password entered again by hand.
Pick a name that does not match a neighbor's network. People join the wrong one when two names look alike. The name is public to anyone in range, so a joke is a joke you are willing to leave on the list.