Hi @kkokoruz
Custom fields and field groups are saved as a post, so you can get it using WordPress’ functions. Maybe something like this:
$field_object = get_field_object('custom_field_name');
$field_group_id = wp_get_post_parent_id( $field_object['ID'] );
$field_group = get_post($field_group_id);
echo $field_group->post_title;
I hope this helps.
