[ANSTHRLD] French surname assistance, 14th c.

[Randy Shipp]

I'm trying to find a surname that will help with canting arms for a
client.  She has greyhounds on her proposed device and would like her
name to cant on that.  French for greyhound is "Lévrier," but
"levrette" is the term for a female greyhound.  I've found a famous
18th c. obstetrician with the surname LEVRET, which is promising, but
I'm not sure where to look to trace its origin.  Thoughts?

--Antoine