It sounds like you have a long hard road ahead of you with all the mystery of name added to the research difficulty for Jewish families in Eastern Europe. I did find the following information at jewishgen.org that may be useful:
Bessarabia Death Records
Name NEPOMNYASHCHY / NEPOMNYATCHA, Meyer Vulf / Meir Zev
Father Abram
Residence Novgorod
Comments Died in Kishinev Jewish Hospital, petty bourgeois from Novgorod
Date ofDeath 25/9/1897 (DD/MM/YY)
Hebrew Date 11 Tishri
Age 28
Cause of Death typhoid fever
Town Kishinev
Uyezd Kishinev
Guberniya Bessarabia
PlaceRecorded Kishinev
Year 1897
Record # M540
Microfilm 2292606
Item 1
Image 204
Archive / Fond NARM 211/11/380
The Boston Jewish Advocate “Seeking Kin” Database
Date of Publication 03 Nov 1921
Person being Sought
Name TEATSCH, Azriel
Residence Greater Boston
Person Seeking
Name NEPOMNIACHI, Chaim-Wictor
Relation [Not given]
Residence Kishineff, Roumania
Agency New England Bureau for Jewish Relief
JewishGen Online Worldwide Burial Registry
Name NIPOMNIACHI, Samuel
Date of Death Dec-1918
Plot Row: 109 Plot: 17
Cemetery Name Cementerio Comunitario de Liniers
City / Country Buenos Aires / Argentina
Name NIPOMNIACHI / ניפומנישצי, Avraham / אברהם
Date of Death 15-Jun-2000
Date of Birth 1909
Hebrew Name אברהם
Plot נד טז 37
Father Solomon / סולומון
City / Country Rehovot / Israel