Mesech — Mesech and Kedar are two sorts of people often mentioned in scripture, and reckoned amongst the barbarous nations. But their names are here to be understood metaphorically. And so he explains himself in the next verse.
Related Commentaries of Psalms 120:5
Psalms 120:5
5 Woe is me, that I sojourn in Mesech, that I dwell in the tents of Kedar!