=DEL.TA=
The overall name comes from the DELTA unit, the elite unit.
DEL also means "delete"
TA comes from the last two letters of DOTA, which represents the game and is also the pinyin of "TA" in Chinese.
So, all the meanings are:
The elite troops, in the game DOTA, "delete" all "others".
MC.Killers Magic Killer, MC is the abbreviation of magic, killer means killer
It can also be translated as "wonderful killer".