The gens Seia was a minor plebeian family of equestrian rank at ancient Rome.
[1] The nomen Seius is derived from the name of Seia, the goddess of sowing.
Chase classifies it among those gentilicia that either originated at Rome, or cannot be shown to have come from anywhere else.
[2] The main praenomina of the Seii were Lucius and Marcus, two of the most common names throughout Roman history.
Other common names were occasionally used, including Gnaeus, Publius, and Quintus.