Can I change my clan name ? Help
"Here’s the short of it: Clash Royale doesn’t allow players to directly change the name of their clan once it’s created. This might seem like a bummer, but it’s how the game keeps things consistent and avoids confusion.
However, don’t lose hope! While you can’t change the name directly, there’s a workaround. You have to create a new clan with the preferred name and then invite all your clan members to join the new clan. Although it requires effort, it’s the only way to effectively rebrand your clan."
Source: https://www.playbite.com/how-to-change-clan-name-clash-royale/