Sarah L Meyer
I looked up NACHATOVICH in Beider's book on Jewish Surnames in the Russian
Empire, without success but changing the C to a K yielded "NAKHATOVICH SM
See NOKHUM" (sm = secondary surname derived >from a masculine given name).
The name NOKHUM is common in Courland, Shavli, Belostok and Petersburg
according to Beider, who also mentions that the German spelling uses a C
instead of the K. Nachman is derived >from Menachem (and means comfort).
Also you need to be aware that the "ovich" end is Russian for "son of ".
Sarah L M Christiansen