Compound last names from Detmold, Lippe Germany #germany


I am researching the last name "Jena" of my maternal Great Grandfather.  He immigrated from Ritschenwalde, Prussia [ Noe Ryczywo'l Poland].  There doesn't seem 
to be any records there of a Jena family earlier than about 1840s.  The only other Jena families that I could located were from Detmold, in Germany, but some of the last names were Jena and others were Michaelis Jena.  Does anyone have any thoughts on why some people would have just Jena and others Michaelis Jena in the same family?

    For example
Joseph Michaelis Jena Kornhändler und Particulierer   1788-1867 • LC3Z-K30
Marriage: 11 Nov 1818    Detmold, Lippe, Deutschland
Brendel Gerson Treuenfels   1800-Deceased • LC3Z-KDG
     ^ Children (6)
Herman Michaels Jena Kaufmann und Rent...   1825-Deceased • LC3Z-KST
Hannchen Jena   1827-Deceased • LC3Z-2NC
Särchen or Järchen Jena   1830-Deceased • LC3Z-2NN
Jacob Joseph Michaels Jena Kaufmann   1833-Deceased • LC3Z-K3C
Rika Michaelis Jena   1836-Deceased • LC3Z-2J0
Auguste Michaelis Jena   1840-Deceased •

 Lew Meixler

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