Find a name with a cell phone number

The 3651 works too.

To obtain a name from a number, you must go to the Police or Gendarmerie, explain the reasons.
If it concerns harassment, you need to request that a statement is made by showing a recent history of calls. Then return to the police station during the next malicious call to file a complaint about it. The police officers will be able to request the telephone operator to provide them with the name of the person who owns the line responsible for the calls.
Under no circumstances will you have access to this information, but the issue will be resolved.

The 3651 only masks your number from the perspective of the recipient. For example, 36510607080910. And as mentioned, unless you hack their operator, it is not possible to obtain their name.

Well, provided you know his city and that his number is not unlisted, you can use the white pages, but otherwise, I don't see how because there can be several people with the same first and last names.