Since God can go anywhere in time and space, there are two sources for the zygotic Jesus that come to mind: Adam and Eve, and David and Bathsheba. This side of the veil, we will not have a definitive answer.
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Except in all the genealogies of Jesus we have in Scripture (Matthew and Luke) there are names given AFTER David. Matthew traces the line through David's son Solomon (Matthew 1:6), while Luke traces the line through David's son Nathan (Luke 3:31). In fact, between David and Jesus, the only names the genealogies have in common are Shealtiel and Zerubbabel (Matthew 1:12; Luke 3:27).
Luke is recording Mary’s genealogy and Matthew is recording Joseph’s. Matthew is following the line of Joseph (Jesus’ legal father), through David’s son Solomon, while Luke is following the line of Mary (Jesus’ blood relative), through David’s son Nathan. Since there was no Greek word for “son-in-law,” Joseph was called the “son of Heli” by marriage to Mary, Heli’s daughter. Through either Mary’s or Joseph’s line, Jesus is a descendant of David and therefore eligible to be the Messiah. Tracing a genealogy through the mother’s side is unusual, but so was the virgin birth. Luke’s explanation is that Jesus was the son of Joseph, “so it was thought” (Luke 3:23). https://www.gotquestions.org/Jesus-genealogy.html
...or need one.