Why is Edward the First (hammer of the scots) referred to as such when technically Edward the Confessor is the first king of England by that name?
There's always more to say, of course, but this is a question that has come up before, prompting a good answer from u/Miles_Sine_Castrum, and you might like to review that thread while waiting for fresh answers to your question.
In the same thread you'll find a discussion of previous kings named Edward – the Confessor was actually the third of his name.