Don’t forget the “ King of the Ecclesiastical State” is sometimes linked to royal status. But that title is infrequently used for the Pope, who has absolute power over Vatican City.Don't forget that there are still many royal families in Europe. Apart from the UK there are Belgium, the Netherlands, Denmark, Norway, Sweden, Spain, Leichtenstein, Luxembourg, Monaco, and Andorra although the last four are either duchies or principalities. The first five and the UK have familial links albeit some may be quite long in the tooth!
God Bless Her Majesty.