This Dave lore question comes up every six months or so, so a while back I decided to save the clip of the moment the meme started, so I can easily post it and DEBUNK all the wrong stories about it:
July 1st, 2017:
View attachment 3592303
And that's all there is to it; some random donator called him Dave without any explanation, never to be seen again. The name stuck because of DSP's typical bad reaction to it. There's no proof of it having to do with his dad's name, if it was a mistake or intentional or anything like that, since there never was given any context. His chat then kept calling him Dave and Tevin ran with it because it annoyed DSP even more, and that's about it.
It's funny as fuck, though, and a prime example of how to properly troll DSP (too bad he had to attach money to it).
I especially love the moment where you can see he's illegitimately annoyed by someone calling him Dave...
... and then the split second where you can just see him think:
"Why the fuck is this dirty troll calling me Dave!?", while dozens of detractor theories are running through his mind.
Lmfao.