Rahmin was a Caatati who captained a ship of refugees.

When encountered by the USS Voyager, he explained that his family and his people were assimilated by the Borg and were left with nothing. Captain Kathryn Janeway offered him supplies and he gratefully accepted. (VOY: "Day of Honor")

Rahmin was played by actor Michael A. Krawic who filmed his scene on Wednesday 2 July 1997 on Paramount Stage 9.
His costume from this episode was later sold off on the It's A Wrap! sale and auction on eBay. [1]
The novelization of the "Day of Honor" episode gives the character's full name as Temmis Rahmin.