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The artist's actual name is "歯", which roughly translates to "teeth" and is pronounced as "Ha".
The username "ehrk5824" then, is taken from Ha's username on danbooru.
https://danbooru.donmai.us/posts?tags=ha_%28user_ehrk5824%29 Updated by anonlv000 Wed, Sep 22 '21, 05:56 | Version 1 |