You're likely thinking of
Stephanie Laurens, a popular author who writes historical romance novels. She's known for her "Cynster" series, which features characters with last names like "Hamilton," but she has never written a book specifically titled "Hamilton."
It's possible that you're misremembering the title of a book or the author's name.
If you could provide more details about the book you're looking for (e.g., a specific character name, the time period, the cover art), I might be able to help you find it!