"Dark" is just a placeholder name equivalent to ?????? or WTF? Dark Matter originally just meant a catchall for anything we had problems detecting back when we were getting good enough at finding things and had a big data pool to actually be able to meaningful say things like 'There should be more stuff here.' There's really no relationship between the two.

The core problem remains, we can detect way more gravity localized around galaxies, this means mass (presumably anyway) in excess of what we can account for, if it's got mass it should be some discreet particle(s) having ruled out (more or less) things like MACHOs and RAMBOs. It's not ideal but postulating a type of matter with rest mass that interacts only very weakly beyond gravitationally isn't that weird a concept. A neutrino is the same, just without rest mass. Dark Energy is a whole different cup of tea. Dark Matter requires nothing weird then basically a neutrino that has mass.