My 1950 black FW is named "Bobbi". This is after the FW bobbin I found in my Mom's stuff and took for "bait". Two weeks later I found my her on craigslist, and the seller, who's name was "Bobbi", lived six blocks from my Mom.
My 1948 repainted Purple FW came with "Laverne". Not sure if she will stay that name but she does have lots of personality.
My 1928 66-6 is named "Gladys" after my grandmother, who was the original owner. My grandmother hated the name and went by her middle name Bernice (she had been teased as "Happy Bottom" as a child).
The 1976 Elna Lotus is "The Lotus".
Still thying to think of one for the 1886 Improved Family. Others I have not named ...