原I sincerely hope Marlowe doesn't turn into a feminine name. With the rise of Harlow, it very well may turn into one. I really detest the fact that it has been made somewhat unisex. It is softer, yes. However, it still strikes me as strong, especially with this spelling.
原I'm surprised the site doesn't list the alternate spelling "Marlo", and that it is also used as a female name now. A famous bearer is Marlo Thomas, whose real name is Margaret. I know at least two females who were named after her.