Peter de Valera ap Smith

Lord High Admiral of the Imperial Navy, Commander of the Combined Fleets, Knight Commander of the Order of the Golden Leopard, and Chief of Staff for Naval Operations.

His name is intereting because of what it says about Anglo-French history. The 'Smith' comes from England, the 'ap' comes from Wales, and the 'de Valera' comes from Spain. Garrett probably intended it to come from Spain via Ireland, as he may have believed that the Irish revolutionary Eamonn de Valera had Irish origins dating back to the time of the Spanish Armada of our timeline (1588), when some Spanish sailors and soldiers settled in Ireland. But Eamonn de Valera was born in New York, possibly to a Spanish father.

So, how to explain the name? There was no Spanish Armada in the Lord Darcy universe because there is no Spain to produce it. Some people from the Iberian Peninsula, most likely Castile or Aragon may have settled in Ireland to produce the first part of the Admiral's name. They may have settled in Wales and combined surnames with a Smith who had moved there from England.

Appearances
Too Many Magicians The Sixteen Keys