I am directly related to quite a few Mell family members who lived in Amsterdam during the 1800s and the early to mid 1900s. I believe that many of the Mells living in Amsterdam may be relatives and would love to establish contact. Your posting is an old one and there is no e-mail address connected to it, so I don't know if you'll get this or not.
Write me if you get this and I'll tell you more. Also, if you get this, let me know the names of your ancestors -- especially great-grandparents etc. Where they all born in Amsterdam?