The men -- who were all wearing balaclavas -- stabbed the youth up to five times.
The teen suffered injuries to his leg, back and stomach during the attack which happened at around 9pm on Friday.
The victim has since been discharged from Connolly Hospital in Blanchardstown.
The teenage boy is related to well known bare-knuckle boxer James Quinn McDonagh who starred in the award winning documentary Knuckle.
Sources say that the stab attack may be linked to a bitter north Dublin Traveller feud.
However, it is understood that the teenager has no involvement in this feud.
A man in his 20's was arrested in the Finglas area over the weekend in relation to the attack.
A source said: "Thankfully the victim will survive -- his injuries were not life threatening. But what happened is certain to increase tensions after a period of relative calm."
There had been no major incidents linked to the feud for almost five months after a major policing plan was put in place as well as mediation efforts by community activists.
The situation had also been helped after some of the main protagonists were sentenced to various prison terms.
However, following the vicious stabbing there are now fears that the situation could "kick off" again.
Last March, the feud threatened to spiral out of control after a pipe bomb attack in Finglas. At least two people were hospitalised and three men arrested when two groups of feuding Travellers were involved in a pitched battle.
A vehicle was attacked after it crashed into a wall and sources say that a gang used spades, hurls, sticks and axes to attack the car and its driver
The riot was linked to the dispute that has seen a number of arson attacks, including an incident in the summer of 2011 in which destroyed a house.
Three young children were lucky to survive after their home was torched in a late-night petrol bomb attack.
Two petrol bombs and a number of shots were fired at the home in Avila Garden.
There have been more than a dozen pipe bomb incidents linked to the feud, as well as at least two shootings.
The feud has led to a number of families being forced to flee their homes to locations in Co Meath and Co Westmeath.