Bayal Sego was a male Milvonian engineer in the 24th century.
Sego was approached by Morn to construct a mobile emitter for Vic Fontaine. The Federation Security Agency and Temporal Investigations pushed for Sego to be extradited from Stervon IV to Andor, but Sego was later released, as he was not a Federation citizen. (DS9 novel: The Long Mirage)