One of the drivers, 55-year-old Johnny Hannah, was from Oregon, according to the Kern County coroner.
All lanes re-open-d around 9:15 a.m. Tuesday. Traffic had been diverted onto northbound Highway 99 and westbound Highway 46, then back onto I-5.
The Kern County coroner's office identified two of the drivers Wednesday as Hannah and 45-year-old Robert Puga, of Lancaster, Calif.
The third driver's name was withheld.
The California Highway Patrol said one of the drivers allowed his southbound truck to drift across the dirt center divider and into the northbound lanes - into the path of the two northbound semitrucks.
The CHP said it was investigating what prompted the driver's rig to veer into oncoming traffic.