Imhotep

The Imhotep are a humanoid species with vaguely amphibian characteristics from the Delta Quadrant.

For years, the Imhotep were at war with the Antarians and the Terrellians. Only in the late 2370s was a peace treaty finally signed, ending the conflict. In it's place, a race would be held every year, the Antarian Trans-stellar Rally, which was first run in 2377. (VOY: "Drive")

Although unspecified in the episode, based on the Neelix and Sevens race updates, we can assume that Assan and his flight partner were members of the Imhotep race.

Imhotep is also the name of an ancient Egyptian god on Earth. There is supposedly no relation, but that is clearly where the writers got the name.