From the Yad Vashem archives in Israel, here are names of some of the Filreis family who were killed by the Germans during World War II. Most of them were exterminated at Treblinka:
Koldra, Lea, born 1881
Szejnfuks, Manja, born 1907
Filreis, Genia, born 1915
Filries, Szimon, born 1915
Filries, Max, born 1900
Filries Tauba, born 1895
All were from Warsaw, Poland. I'm guessing that "Filreiss" is a real alternative spelling and that "Filries" is a mistake in transcription at some point (these are just guesses).
The names were submitted by Mrs. Idia Kcefner (I don't know who she is) in 1957, by Mr. Moshe' Koldra (ditto) in 1956, and by Zalman Akerman** in 1999.
For more about Zalman Akerman's story of survival, go here.
** Haya Filreis, married into the Akerman family, was Zalman's mother. Zalman and his mother lived for a time in the Warsaw Ghetto after the mass deportations from the ghetto had begun. Zalman is alive and well and living in Israel, and is the provider of this information, by way of Steve Filreis (my father's cousin Mel's son) and Ayelet Regev (one of Zalman's grandchildren). Ayelet (currently studying law in the U.S.) is my father's father's cousin's son's granddaugther, a closer relation that that phrasing makes it seem.