Meso'Clan was a Jem'Hadar soldier who served under First Goran'Agar.

In 2372, he followed Goran'Agar to Bopak III to be cured of his addiction to ketracel-white, though that did not happen. Meso'Clan was assigned to stand watch over Julian Bashir and Miles O'Brien as they worked to find a cure. When another Jem'Hadar soldier was hit by a plasma charge, Meso'Clan was up to kill the injured Jem'Hadar but was ordered to leave him by Goran'Agar. (DS9: "Hippocratic Oath")

Meso'Clan was played by Jerry Roberts.
His name comes from the script.
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