I am Gary Koven, born in New York City in 1953. My biological family includes only Kovens. My extended family includes Kovens and deKovens.
My father, Mark Seymour Koven, was born in Boston in 1923. My father relates that his parents became family friends with Henry deKoven, who was an actor in Boston. Henry deKoven, now deceased, later extended his career to New York City where his daughter Gloria deKoven Diabo (born approximately 1948) worked for the Rivoli Theater for many years.
My father theorizes that Henry may have been a descendant of the Hessian von Kovens in the time of the Revolutionary War who returned to Moldavia and eventually came to Canada (see my other thread for the von Koven theory).