I am Russian, never ever hear this name "Tallan" and never met anyone with this name in Russia.Are you challenging me? Perhaps you are unaware that when immigrants with long names came through Ellis Island, the names were truncated and "Americanized" often not by the Federal officials as commonly believed but at the request of the immigrating family.
https://www.smithsonianmag.com/smithsonian-institution/ask-smithsonian-did-ellis-island-officials-really-change-names-immigrants-180961544/
Regardless of how it came to be, one of my relatives did an exhaustive search and found that my family's original name was "Telushkin" and that we came from a village long ago decimated, the Village of Slutzk.
https://www.jewishgen.org/yizkor/slutsk/slu-xi.html
Anything else Chakster?