Hi Ron,
To my knowledge, there is only one street named "Hildeen" in Lexington, and that is Hildeen Drive, which intersects Zandale Drive. I do not know the origin of the street name; however, it is not uncommon for developers to name the streets after people in their family or others familiar to them. It's possible that someone on the development team for that neighborhood had the same last name as you.
Sorry I couldn't give you any more concrete information. Perhaps the Lexington Homebuilders Association might be able to provide some insight? Their web address is
www.hbal.com. They may have records of who developed that particular street.
Good luck!