[S39] Estonian Jewish Genealogy, Mark Rybak, (http://eja.pri.ee/), Listed as Mother of Gabrial Pikarevitsch.
In the record her name is shown as Anna Samuilovna (Gurevitsch) mar. 1920.
Adir, her grandson gives her name as Chana-Dvora. Anna looks like an English form of her name. Samuilovna is a patronoymic meaning the daughter of Samuil.