kubeconfig is the most commonly used name to identify the kubectl configuration file in a user environment.

By convention kubectl looks for configuration in the file referenced by the KUBECONFIG environment variable or at the default path $HOME/.kube/config and that file is commonly called a kubeconfig.

A kubeconfig file contains entries for clusters, users, and contexts so kubectl can authenticate and select the correct cluster and user for commands.

kubectl.yml is incorrect because kubectl does not use that conventional filename for its configuration and YAML files with similar names are usually used for resource manifests rather than client configuration.

gcloud is incorrect because that name refers to the Google Cloud SDK command line tool and not to the kubectl configuration file.

kubecttle is incorrect because it is a misspelling of the kubectl command and it is not used to name the configuration file.

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