[Ger-Poland-Volhynia] name Mitzlaff

[marlo]

Can anyone give me an answer.  A great-aunt, Wilhelmine Loroff (Lohroff) married to
Rheinholdt Mitzlaff, date unknown, place unknown except probably in Pommern.  They came to US, date unknown, but appear in 1880 census in Ohio,  then later in Long Island New York.  When they came they had child or children.
I have not been able to locate when or where they came into US.
Can someone tell me how to locate them? I have tried passenger lists for both New York and Baltimore and Philadelphia, name spelled Mitzlaff, Mitzloff, Metzlaff, Metzloff.  I know I really don't know anything much so there is not much to go on but I would like to know when they came and where they came from. The more I look the more
frustrated I become.
Thank you.
Margaret
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