This bugs me a lot. The fact that The MH-9 is known as the Little Bird and the AH-9 is known as the Killer Egg.
Both names are already taken by the MH-6(Little Bird) and the AH-6 (Killer Egg). They are not the same aircraft (By design). I would goes as far as to say, Both Aircraft types are COMPLETELY different from each other.
TL/DR:
Do better job of giving the BLU-FOR Helicopters there own unique name/nickname.