Derek

Moshi played Darkest dungeon on her first stream on her twitch channel. You can name your party members in this game, so she asked chat for names. Somebody suggested Derek and was pretty vocal and adamant about it. Moshi decided that every character should get a variant of this name. I kinda stuck as the naming scheme for Darkest Dungeon (Which is also why the game is sometimes called "Derekest Dungeon" here). Popular names include:
 * Daddy Derek
 * Dereka

The Donation ticker and top donation also reference this meme with "Derek of the hill" and "The Derekest Derek".
 * Edgerek
 * YanDerek
 * Derekias