Literally just "hillock, wee hill’", but Gemma Smith's research suggests it was originally Càthair a’ Chnocain, "the seat of Knockan."
Not be confused with Knockan Crags
Gemma Smith: "The Gaelic spelling is Ailbhinn, which Watson translates as ‘rock-peak’, taking the specific element to be beinn, ‘mountain’ given the stress on the second syllable. The possibility remains of ail fionn, ‘white rock’, or even aoil…