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The project "Trup Diaspora" is a genealogical project aimed to connect families known to be related, and, of family Trup.
Nowadays the family exists under different names derived from Trup, such as Troop, Troup, Troupp, or Trupp, as well as under surnames people may have received via marriage or what-have-you.
What is known (with some certainty) is:
i) The origins of the family, as we know it, are in Rēzekne, formerly part of the Russian Empire, in the current day Latvia, and around it, in Latgale.
ii) The ancestor of the families around the world, was Nochim Halevi Trup (Nachum / Noah / Trupp) (born ca. 1800 (1798?) (or his alleged father, Leiba Trup, b. ca. 1770).
iii) As might be clear already above, the exact names of the ancestors are not known. The spelling depends on the Russian, East-European, and German influences. Transliterations of the names are manifold. Therefore, for starters, the names, by and large, conform to the names found in JewishGen).
iv) So far the genetics have already united a Finnish family Troupp (the perspective of yours truly) to a British family Trup, an to American families Troupp and Troop.
v) The male Trup Y-DNA is of type R-M198
Just 30 km from Rezekne to Trupi
What is not known (with enough certainty) is:
Currently it is not known whether or not the late Alexei Trupp (Troupp) who was a footman to Tsar Nicholas II of Russia, and who was executed with the royal family in Yekateriburg was related. Either way, he was from Rēzekne as well.
I know of living relatives of his. He should have living male relatives under the name of Trūp or Trūps, females under the name of Trūpa. Or maybe other variants. Member of these families, or any other related families are encouraged to contact the project.
On Rēzekne:
According to the Wikipedia on Rēzekne, it says:
Rēzekne (Latgalian Rēzekne or Rēzne, Latvian: Rēzekne, is a city in the Rēzekne River valley in Latgale region of eastern Latvia. It is called The Heart of Latgale (Latvian: Latgales sirds, Latgalian: Latgolys sirds).
Rēzekne was historically known as Rositten in German. A Russian name from the time of the Russian Empire was РҌжица (Rezhitsa) although Резекне is currently used. Some other names for the city include: Polish: Rzeżyca and Yiddish: רעזשיצע Reżice.
Built on seven hills, Rēzekne is situated 242 kilometres (150 miles) east of Riga, and 63 kilometres (39 miles) west of the Latvian-Russian border, at the intersection of the Moscow -Ventspils and Warsaw-Saint Petersburg Railways. It has a population of 31,216 (in 2016) making it the 7th largest city in Latvia.
Ruins of the Rezekne Castle
From a genealogical research point, the following is of importance:
In 1773, Rēzekne received city rights. Known as "Rezhitsa" during Russian rule, it was an uyzed center first in Pskov Governorate between 1772 and 1776, then Polotsk between 1776 and 1796, Belarus between 1796 and 1802 and finally in Vitebsk Governorate between 1802 and 1917."
The importance of this lies in studying old documents where the origins of any given person may be the Governorates of Pskov or Vitebsk as well as other towns or villages close to Rēzekne which, often times, come up. Thus, this historical timeline may explain some of the variance in the origins of some family members in some documents. And one should not forget that, at the time of the current history of the family, Rēzekne was part of the Russian Empire. Hence, the birthplace "Russia" comes across in various documents ever so often.
Pskov Governorate (Russian: Псковская губерния, Pskovskaya guberniya) was an administrative division (a guberniya) of the Russian Empire, which existed from 1772 until 1777 and from 1796 until 1927. Its seat was located in Opochka between 1772 and 1776, and in Pskov after 1776.
Vitebsk Governorate (Russian: Витебская губерния, Vitebskaya guberniya) was an administrative unit (guberniya) of the Russian Empire, with the seat of governorship in Vitebsk. It was established in 1802 by splitting the Byelorussia Governorate and existed until 1924. Today most of the area belongs to Belarus, the northwestern part to Latvia and the northeastern part to Pskov and Smolensk Oblasts (meaning area or region) of Russia.
History of the Jews of Rēzekne:
The Jewish community of Rēzekne dates from the end of the 18th century.
During the period of the independent Latvian republic (1919-1940), several Jewish schools with different political and cultural affiliations operated in Rēzekne. In 1935 3,342 Jews lived in Rēzekne, comprising approximately 25 percent of the town’s population.
After the Soviet occupation of Latvia in June 1940, all private enterprises were nationalized and Jewish community institutions were closed. Some Rēzekne Jews were arrested during the night of June 14-15, 1941 and exiled to locations deep within the Soviet Union.
During the first week of the German-Soviet war the old border between Latvia and Russia was closed. Nevertheless, many Rēzekne Jews Jews managed to flee into the Soviet interior.
The Germans occupied Rēzekne on July 3, 1941 and, with the assistance of Latvian collaborators, began murdering Jews almost immediately. Most Rēzekne Jews were killed by the Germans between July and November of 1941. Only three people from the entire Rēzekne Jewish community survived – the child Motya Tager, 57-year Chaim Izraelit, and his teenage nephew Yakov Izraelit. 
The Green Synagogue, Rezekne
Further reading
The Trup Family History written by Cyril Trup from 1995 can be downloaded from the link in pdf.
Honors
This project was established in honor of the late Rabbi Len Troupp and his persistent interest to unite the family. Rabbi Len passed away at the age of 67 in November 26, 2013 in Naples, Florida, and was buried at his home at New Montefiore Cemetery in West Babylon, NY, USA. I had the privilege to know him for a short period of time, and what I knew of him is that he'd be "happy as a puppy" with this project.
In addition, this project is to honor the late Alan Troop (1945-2014) whom I was privileged to know as well. (And who was connected by DNA to Len, before I managed to contribute Finnish Troupp DNA, and establish the blood relation to him as well.) Alan was an author of several novels and, prior to his passing away, he was about to write a book on Alexei Trupp. We had a project together (and I haven't given it up) to collect DNA from the late Alexei Trupp.
This project was launched by Mikko Laakso on May 30, 2017.