Something that Rhymes, Something funny, your names (since you are worried that someone will quit, then find a partner you know will stick around, or if you aren't up for it dot do it), but with adding someone new you wouldnt want to change the name or even consider it, they didnt make the channel, they didnt start anything, they are just a position filler / small time partner.
In the end, no one here or on the internet will give you a "Brandable Name" because they would rather keep it for themselves or sell it. You have to be creative and witty when making a name, it's not something anyone can hand you. If you cant make a name on your own, then a script or "pranks" to do would probably be half assed or on the fly, messing up and crap like that.
So do what you gotta do, you could have the best name in the world but without material no one will watch you. A real life example is Angle Soft toilet paper. It wouldn't be much of a product if it dissolved from the moisture in your hand or felt like sand paper.
Also a lot of people think they can live off of Youtube, but you need 10s of thousands of views just to make a couple bucks. Find investors and a sponsor and you might be a sellout but you could prank the shit out of someone wearing some fly threads.
