The Mayor of Nice Christian Estrosi announced this on social media on Saturday morning.
The other two victims of the attack were the mother of three Simone Barreto-Silva, 44, and church worker Vincent Loques, 55.
It came after Reuters reported that a third person was arrested in connection with the murders at Notre Dame Church.
The person being detained is believed to be a 35-year-old Nice resident who is suspected of meeting the suspected attacker the day before the atrocity.
A police source told Reuters that the last arrest was on Friday.
The two previously arrested were the 21-year-old suspect Brahim Aouissaoui and a 47-year-old man who was detained on suspicion of contact with Aouissaoui.
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After the attack, French President Emmanuel Macron deployed thousands of soldiers to protect places such as places of worship and schools.
Aouissaoui was reportedly unknown to security services after arriving in Europe by boat last month.
In France, tensions have increased over caricatures of the Prophet Muhammad, which Muslims consider offensive.
The attack in Nice occurred almost two weeks later Samuel Paty – a teacher in Paris – was beheaded by an 18-year-old Chechen after showing a cartoon to students in a lesson on freedom of expression.
The dispute over representations of the Prophet Muhammad has led to protests around the world in countries such as Lebanon, Pakistan, Bangladesh and Somalia, with calls for a boycott of French products.
After the attack, President Macron said the country was targeted “through our values, our tastes for freedom, the ability of our soil to have freedom of belief”.
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