Argon in Quenya is Arakano.
Said to be 3rd son of
Fingolfin, had no
children,
name was never Sindarinized.
Died in the "Battle of Lammoth",
Fingolfin's
first meeting with the orcs in Middle-earth..
Reference: "The Shibboleth of Feanor" in The Peoples of Middle Earth, which is Vol 12 of The History of Middle Earth