Sets the site name assigned to the network if one has not been populated.

Source

private function _set_site_name() {
	if ( ! empty( $this->site_name ) ) {
		return;
	}

	$default         = ucfirst( $this->domain );
	$this->site_name = get_network_option( $this->id, 'site_name', $default );
}

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