Mr Wilk was a Polish national who had settled with his partner, Elzbieta, at Maglin on the outskirts of Ballincollig.
Both Mikolaj and Elzbieta were taken to Cork University Hospital, but sadly Mikolaj was pronounced dead shortly after 5:30am.
Gardaí in Ballincollig, Co Cork, have launched a murder investigation following the death of a man aged in his 30s over the weekend.
The men, who were carrying weapons, entered the house and seriously assaulted the man and his partner, whose injuries are not life-threatening.
The man later died from his injuries.
There were two children under the age of six in the house at the time of the attack and were uninjured. O'Sullivan said the two children were in the care of social workers.
Shortly after the attack, a burnt out auto was found abandoned a few miles away from the house in Ballincollig, County Cork, Ireland.
Gardaí found a firearm, possibly a handgun, and two machetes in a burnt-out auto that was used by the gang.
"We are continuing to appeal to anyone with information or to anyone who may have witnessed this incident", he said.
Fundraiser has been set up online for Mikolaj Wilk to help Cork murder victim's family.
Police believe the armed gang abandoned their vehicle, setting fire to it following the attack on Wilk and his partner. Wilk, also known as Nick, ran a garden maintenance business in the area and had lived in Ireland for a number of years.