Well I have some ideas you can kindly discard as ABSOLUTE NONSENSE! And then come up with your own eerily similar specialties. I'm also kind of bad at naming specialties.
Some specialties ideas:
Being able to parry and riposte with out a skill penalty - proposed name: Block & Chop
Being able to parry and riposte with one weapon
Being able to charge without a pointy weapon (no extra damage die) - proposed name: Rush/Into the ranks!
Grants the ability to counter an unlimited amount of attacks with a single weapon as opposed to just 1 attack - proposed name: Counter striker
+1 die size on damage roll (or maybe +2 to damage roll) but loosing the ability to counter - proposed name: Swinging for the fences
A shove disrupts the enemy when successful (only when same size or smaller), think a knight kicking another knight in the chest and to the ground - proposed name: Kick'm in the Crest!
Proposed name: Mobbing. Grants unit's the ability to increase the amount of units that can attack a single unit from 3 to 5 (only if all unit's attacking have the mobbing ability)
Proposed name: War cry/squeal. When charging the opponent can't counter attack. (My initial thought was about war pigs making a horrifyingly painful squeal on the charge)
Proposed name: Pocket sand!!!
When counter attacking this unit may try to disrupt his attacker. Roll the unit's skill die, if it comes up higher then the attackers attack roll then unit is disrupted. Requires one free hand.
These are mostly to give different "flavors" to different kind of CC units.
Other ability ideas:
Proposed name: Lightning reflexes. This unit always has a response action to spend on the opponents turn.
Proposed name: Hand slinger. This unit has a base range of 6" when throwing CC weapons. (think Javelin throwers).
Proposed name: ????. Grants + 1d6 to damage roll when when attacking a unit who hasn't detected you with a cc weapon. (think commandos slicing throats from behind)
Just some food for thought I guess.