LoL Thingy is a simple tool that allows you to check directly with Riot servers to see if a summoner name is already taken. Summoners names are reserved separately for each region (i.e., two people can have the same summoner name if they play in different regions).
If the summoner name is available in the selected region, it will be indicated on the page. If the summoner name isn't available, you will be shown the current summoner's information. Happy hunting!
LoL Thingy isn't endorsed by Riot Games and doesn't reflect the views or opinions of Riot Games or anyone officially involved in producing or managing League of Legends. League of Legends and Riot Games are trademarks or registered trademarks of Riot Games, Inc. League of Legends © Riot Games, Inc.