Lemonade and Orange juice is "St Martins"

I thought Lemonade and Orange was "St. Clements" as in the rhyme "Oranges and Lemons, say the bells of St. Clements".

A "Pauper's Black Velvet" is Guinness and Cider.
"Buck's Fizz" is as tentatively proposed twice previously, Champagne and Orange.
But I have never heard of many already mentioned.

Rod