Hi @Julien Camut - you’ll need to reach out to our support team for assistance with changing your organization’s name. The moderators here aren’t able to review or make changes related to accounts/teams/billing settings.
There are some security checkpoints you will need to go through, so my recommendation is to fill out an inquiry on this page here as soon as you are able to: https://help.figma.com/hc/en-us/requests/new
Once you submit that form, you will have a support ticket created. Someone will be able to assist you from there.