Before you transfer a repository, keep these things in mind:
When the current owner initiates the transfer, the new owner will receive an email giving the option to accept or reject the transfer. If the new owner doesn't accept the transfer within one day, it won't complete.
The target account must not have a repository with the same name, or a fork in the same network.
The original owner of the repository is added as a collaborator on the transferred repository. Other collaborators to the transferred repository remain intact.
Private forks can't be transferred.