right. Royals was the brand right? I know the brogues were often called "Royals" as well. I've seen a pair of smooths that were made by Royal. And Loake calls their American longwing the "Royal", I'm sure as a reference/homage to said Royals of your time.
You know how names pass into folklore - Crombie, Harrington, biro, hoover, etc - it was the same with 'Royals', which was our name for smooths. Never mind the origin, it simply became our name for plain lace-ups from the Squire Shop.