Very interesting. Do women's names change? Or is it the last letter of the name that determines the end. Roger becomes Rogerem, Chris becomes Chrisem whether m/f David -Davidem, but Philippa, Liz and Sue seem to remain the same. Is anyone able to explain?
As a similar sentence with Julia (Jestem z Julią) made clear to me, women's names to decline (change according to grammatical role). If Polish is like other declined languages, this may only apply to foreign names when it is clear how they would decline. I would be interested to hear from a Polish person how she would deal with a name like Sue (Susan wouldn't be too hard, though).
Female names and surnames undergo declension only if they end with -a. So "Sue" and "Susan" will always look the same.