Name I came up with a character I was working on and designing. Ultimately, because I wanna to move away from my old username, "ChibiGoku", I decided to go with Mendinso. You can still find my old username at a couple legacy sites (such as Fandom Post, ANN, etc.,), but otherwise I've used Mendinso since forever.
As for the older name? Was a huge fan of Dragon Ball growing up, participated in some old RP sites and just kinda used it as a general username. Plus rooted in with the GT avatar of Goku I had for a bit.