Coming from Old Scottish Gaelic, Kinch means a loop in rope, most often a noose.
However, it also may come from the Old German Künz, meaning honest adviser.
Gifford finds no source for the name Sargent. Perhaps it continues the military theme (i.e., "sergeant") begun in the history of Pyrrhus and echoing on in the battle-cries erupting from the hockey field as this episode plays out.