Menolly wrote (some time ago):-
I remember hearing that Marie was a name or title for a lady in waiting and so not necessarily her name !

Interesting..... It makes me think of a couple of verses from a Scots ballad that I sing called Lord Gordon's Kitchen Boy.
Lord Gordon's daughter falls in love with Willie, her father's kitchen boy. Their love seems to be impossible but she builds and equips a fine ship for Willie to captain......

They hadna' sailed a week, a week,
A week but barely three,
When far unto the coast of Spain,
The wind did blaw them free.
A lady on the castle wa'
Beheld the day going down
And there she spied the bonniest ship,
Come sailing tae her town.

"Come here, come here, my Marys a'
D'ye no see what I see?
Here I spy the bonniest ship
That ever sailed the sea.
It's busk and busk, my Marys a'
Busk and mak' ye fine.
Whilst I must go down to the shore
And mak' her captain mine."