According to Le Monde, he was identified from photographs as Oussama Atar by Adel Haddadi, one of the Syria-based terror suspects he had sent to infiltrate Europe to commit attacks but who failed to reach Paris to take part in the November attacks.
The judicial official said there is evidence that Atar is the real identity of Abu Ahmed, a pseudonym of the suspected attack coordinator.
A source said: "He's the only co-ordinator from Syria to have been identified during the investigations".
French investigators were able to link him to the Paris attacks following the arrests of two suspected extremists, an Algerian and a Pakistani, detained in Austria last December.
Some 130 people died in the attacks on the evening of November 13 2015, when suicide bombers struck near the Stade de France, while gunmen opened fire at cafes, restaurants and the Bataclan during a performance by USA rock band the Eagles Of Death Metal.
They now say he is Osama Ahmad Atar, known for years by the Belgian authorities, and a distant cousin of two of the Brussels bombers, who blew themselves up at Zaventem airport and Maelbeek station in March 2016.
After being released in 2012 he returned to Belgium before apparently making his way back to the Middle East but intelligence services lost track of him months ago.
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His whereabouts are unknown, but some reports suggest he is now based in Raqqa, the main headquarters of jihadist group Islamic State.
French weekly L'Express, quoting sources saying that it was not 100 percent certain that Atar was the man who gave the orders for the Paris and Brussels attacks, but "it was one of the leads being pursued".
Oussama Atar's name has now been linked to both attacks in the role of co-ordinator, but not necessarily overall commander.
Late past year a wave of bombings and shootings killed 130 people and injured hundreds more across the French capital.
Salah Abdeslam, the only surviving suspect of the Paris attacks, remains in police custody.
The pair, an Algerian and Pakistani, were detained on the Greek island of Leros weeks earlier, and were unable to travel on to Paris with the two Iraqis who blew themselves up at the Stade de France in Paris. He then identified Atar from police photos, a source close to the investigation told AFP.