found this on Ancestry.com no idea of how correct it is but if it is it may answer some of your query
What does the
Susan name mean?
Last Name:
Susan 1) English and Dutch: from the female personal name
Susanna,
Susanne (Middle English),
Susanna (Dutch), from Hebrew Shushannah ‘lily’, ‘lily of the valley’.
2)Southern French: from Occitan susan ‘above’, ‘higher’, hence a topographic name for someone living at the top end of a village or on the side of a valley.
3)Jewish (Sephardic): from the male personal name
Susan, a derivative of Arabic susan ‘lily’.
cant find any other referrance to it being a male Jewish name but have seen it as a surname before now

This message was edited 1/18/2006, 11:35 AM