Soncino on Yeshayahu 41:2

roused - viz. Cyrus.  The Targum and Jewish commentators understand it of the patriarch Avraham, but this is less appropriate to the context.

from the east - Elam was northeast of Babylon.

righteousness - here with the sense of 'vindication of the right.'

called - shall meet him, or, 'shall call him wherever he goes.'