Merry Gentry, a series of books by Laurell K. Hamilton where this is the pseudonym of central character Meredith NicEssus
The point of divergence from normal history is not provided, although hints are given about how the faerie history intersects with human history (Adolf Hitler, the Irish Potato Famine, and Thomas Jefferson are examples).
The Merry Widow | Montgomery Gentry | The Merry Wives of Windsor | Have Yourself a Merry Little Christmas | Merry Christmas Baby | Merry Hill | Merry Gentry | Kenneth Gentry | gentry | The Merry Widow (1934 film) | Rafael Merry del Val | Merry Maids | Merry Christmas, Mr. Lawrence | Burke's Landed Gentry | Bobbie Gentry | William Davis Merry Howard | We Wish You a Merry Christmas | The Merry-Go-Round | The Maypole of Merry Mount | Merry Hill Shopping Centre | Merry-go-round train | Merry Gentry (series) | Merry Christmas Darling | Merry Christmas | Jackson Central-Merry High School | William E. Merry | Transatlantic Merry-Go-Round | The Merry Wives of Windsor (opera) | The Merry Widow (1952 film) | The Merry Macs |
Barinthus, a character in the "Merry Gentry" series of books by Laurell K. Hamilton
In Laurell K. Hamilton's Merry Gentry series, the fear dearg makes an appearance in the book Divine Misdemeanors, where he asks Merry to give him a proper name.