My mother's sister, Eva Rosette FIRST, nee BLOCH, was deported from
Hannover, Germany, to Riga, Latvia (Arolsen) on 15 Dec 1941, and was
sent >from Riga to Stutthof, where she died, on 1 Oct 1944. My mother
told me many years ago that Eva met and married her husband in the
concentration camp. This most likely was Kaiserwald or one of the other
camps in the Riga complex, because Eva died very soon after arriving at
Stutthof, and she is listed there by her married name. She was still Eva
BLOCH when she and her parents were taken >from Hannover.

Outside US/VK you don't change your official name on marriage.
So if your conclusion is based on official documents, perhaps that makes
this incorrect.

I know > absolutely nothing about Eva's husband except that he survived the war.
I would like at least to know his given name, and where and when he was
born, but with a surname that's also a very common English word, and no
other information, I've come up empty on every search. I've tried
FamilySearch, Yad Vashem and the US Holocaust Memorial Museum. Can
anyone suggest where else I might search for information about him?

212. Eva Rosette First geb. Bloch, * 1.2.1919?) , Tochter von Iwan und Toni,
am 16.4.1936 nach Hannover in die Veilchenstr. 3b, Anfang Sept. 1941
umgesiedelt ins Judenhaus Lützowstr. 3 (oder Ellernstraße 16a?), dep. von
dort aus am 15.12.1941 nach Riga (Arolsen), am 1.Okt. 1944 durch Sipo Riga
ins KL Stutthoff, 1948 für tot erklärt (s.auch Peter Schulze S. 15)
<http://www.juedische-geschichte-diepholz.de/13schicksale_nazizeit2.htm>

The "Peter Schulze page 15" probably is meant to refer to:

Beiträge zur Geschichte der Juden in Hannover
by Peter Schulze
Hahnsche Buchhandlung, 1998
<https://books.google.com/books?id=CXUTAQAAMAAJ>

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