如何引用父类在 C# 中使用的接口？

我有一个我的班级使用的接口。我有一个子类，我需要用它来引用这个接口。我似乎无法弄清楚，这是代码：

界面：

public interface ICanBeCalled
{
    string NameCalled{ get; set; }
}

父类：

public class ParentClass: ICanBeCalled
{
    private string _name;

    public string NameCalled
    {
        get => _name;
        set => _name = value;
    }    

    // functions below are omitted as not part of question
}

子类：

public class SubClass : ParentClass
{
    // Here I want to be able to set and get the name var, 
    // how can this be done? 
    // Ideally the set functionality would have it 
    // hard coded in a private string.
}