Two lorry drivers have been charged with causing death by dangerous driving.
Three passengers, including a five-year-old girl, are fighting for their lives.
The bus was carrying a group of 11 passengers who were being driven to London to meet a coach which was taking them on a last minute holiday to France.
Three of the six men and two women who lost their lives in the pile-up have now been named Indian nationals who were working for Nottingham firm Capital One.
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Another employee, Mano Ranjan Panneerselvam, is one of those critically injured in hospital along with the five- year-old girl who is understood to be the daughter of one of the other passengers.
Panneerselvam's wife and mother are said by relatives to be the other women who were hospitalised, whilst three of his family members are understood to be among the dead.
He had been hired to take the group from Nottingham to London when the crash happened near Newport Pagnell in Buckinghamshire in the early hours of Saturday morning.
His friend Manu Zachariah paid tribute to Joseph, also known as Benny.
Zachariah said: "Cyriac was not like normal fathers. He would love to spend his money and time on his children like none of his friends. He was always very encouraging of their extracurricular activities. His son is an athlete and he would take him to javelin training.
Ryszard Masierak of Evesham, Worcestershire, has been accused of eight counts of causing death by dangerous driving, four counts of causing serious injury by dangerous driving and eight counts of causing death by careless driving while over the prescribed alcohol limit.
The 31-year-old appeared before High Wycombe Magistrates' Court today and has been remanded in custody.
David Wagstaff, 53, of Stoke-on-Trent, is charged with eight counts of causing death by dangerous driving and four counts of causing serious injury by dangerous driving.
Brett Smith, who passed the scene in a taxi before the emergency services arrived and stopped to help the little girl, said: "A family has been destroyed. I held a little girl by her arms, trapped inside a vehicle, for a good hour or so with the emergency services and the fire service trying to help.
"I walked home with a blanket that the ambulance service provided me to stay warm because the little girl has got my jacket to keep herself safe. The fire and ambulances services did a really good job."