The first Ferengi to join Starfleet is Nog.
Nog is a character in Star Trek: Deep Space Nine and the son of Rom. Initially portrayed as a mischievous young Ferengi working at his uncle Quark’s bar, he gradually develops a strong interest in education, engineering, and the ideals of the Federation.
With encouragement from Jake Sisko and a recommendation from Commander Benjamin Sisko, Nog applies to Starfleet Academy. His decision is significant because Ferengi society is traditionally centered on commerce and the pursuit of profit, rather than military service or exploration.
Nog is often confused with Rom, Quark, or Brunt, but those characters do not hold the distinction. Played by Aron Eisenberg, Nog later serves aboard Deep Space Nine and the USS Defiant, earns a commission, and becomes an important Starfleet officer during the Dominion War.