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Greetings,
Here's what we found out about "Mercer."
First, we'd like to say that the research you did was excellent; very few people find out as much about their names, or pay so much attention to detail. Comments on your name included "what a wonderful name" and "I love this woman."
As far as our research shows, "Johanna Mercer" would be the most likely form of your name. By 1400, hereditary surnames were fairly common and the use of French was declining; although "le Mercer" would be an appropriate form, just plain "Mercer" is more likely.
If you need any other assistance, please let us know.
In Service,
Alan Fairfax
Academy of St. Gabriel