The 33-year-old was a passenger in one of the cars that was involved in the two vehicle impact that left four others injured.
None of the injuries sustained by the other four people are said to be life threatening.
Mr Henning was a member of a family originally from South Africa which runs a jewellery manufacturing enterprise at Killawalla, Westport.
The collision prompted renewed calls by local elected representatives to Transport Infrastructure Ireland (TII) to reduce the speed limit in Breaffy
Fine Gael TD Alan Dillon, along with his party colleague Councillor Cyril Burke and Independent Councillor Michael Kilcoyne, demanded that the TII take immediate steps to reduce the speed limit through the village to 60 kilometres per hour.
Meanwhile, a woman in her 80s was rushed to hospital by air ambulance yesterday after a serious crash in Co Donegal.
The collision between a car and a van on the outskirts of Ballyshannon occurred at 2.25pm.
Emergency services rushed to the scene, creating long traffic delays.
An air ambulance was sent to the scene and the woman was taken away for treatment.
Seven people, including Mr Henning, have been killed and several others injured in road crashes since St Stephen’s Day.
A man in his 30s died following a crash that involved a car and bus in Co Wicklow on Monday night. The collision occurred at around 9.50pm on the M11 at Ballynabarney.
The man who died was the driver and sole occupant of the car and was pronounced dead at the scene.
The dead man was named locally as Sean Hanley from Newtownmountkennedy, who was in his 30s.
There was also widespread shock at a horrific road traffic collision in Northern Ireland in which three young men died.
The collision between a car and a lorry occurred at 1.50am on Monday on the Omagh Road outside Garvaghy in Co Tyrone.
The three victims were named locally as Nathan Corrigan, Peter Finnegan and Petey McNamee. A fourth man in his 20s was rushed to hospital with serious injuries.
Separately, a cyclist in his 80s died in Dublin when a car and bicycle collided on Monday afternoon.
The collision occurred on the Killeen Road in Ballyfermot shortly before 1pm and the cyclist was pronounced dead at the scene.
A 23-year-old driver also died in a two-vehicle road crash in Ferns, Co Wexford, on St Stephen’s Day.
The young man was named locally as John Power, who was well-known in the Wexford town.
The driver of the second vehicle and sole occupant of the car, a woman in her mid-50s, was seriously injured and was in critical condition in St Vincent’s Hospital, Dublin.