Name Changing

I want to change name to 'HoJoon' but the thing says its not allowed. So I went to league chat and typed 'Hoj' and apparently it comes up as ***. Like rarely anyone knows this word and I didn't even know what it meant. I search it on google and it was very irrelevant to like a curse or bad word. Can I please change my league name to the name that i desire for? Thanks.
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