The Dictionary of English Surnames site (here:
http://www.s-gabriel.org/names/talan/reaney/ - I originally got this link from
Miranda who as you know prizes accuracy, so I trust it) lists the following forms of
Mary in England:
Before 1250:
MariaMarieMarionMariot
Mariota
1250-1450:
MariaMarieMarionMariot
Mariota
Mariun
Mary
After 1450:
Mary
Additionally, one of the most famous historic Marys,
Queen Mary of England, was born in 1516, and the reformation under her father,
King Henry VIII, began very decisively some 17 years later in 1533.
Queen Mary also had an aunt
Mary (
Mary Tudor,
Henry's younger sister) who was sufficiently older that when she died in 1533 she had been married twice, her first husband having died in 1515.