If a player changes their name, their head with the previous name will say "That player was not found on meepcraft"
With /history you should be able to implement a way for for you to click on the head with the previous owners name and have it show up as the current name of the user.
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Hi there Guest! You should join our Minecraft server @ meepcraft.com
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We also have a Discord server that you can join @ https://discord.gg/B4shfCZjYx