The Collaborative International Dictionary of English v.0.48:

Skerry \Sker"ry\, n.; pl. Skerries. [Of Scand. origin; cf.
   Icel. sker, Sw. sk[aum]r, Dan. ski?r. Cf. Scar a bank.]
   A rocky isle; an insulated rock. [Scot.]
   [1913 Webster]