Shem is traditionally listed first among Noah's sons in the biblical account after the Flood.
Genesis 9:18 names Shem, Ham, and Japheth as Noah's sons who came out of the ark. In Genesis 10, the genealogical material begins with the descendants of Japheth, then Ham, and then Shem, but Shem is repeatedly given a prominent position in the family line.
Genesis 11 traces a line from Shem to Abram, making Shem especially important within the biblical genealogy leading toward Abraham. The name also appears in the term “Semitic,” a later linguistic label historically connected to the biblical name, though modern scholarship uses language-based classifications rather than treating the genealogy as a biological taxonomy.
The question asks for the first son named in the post-Flood family statement, not the oldest son by modern birth-order assumptions. Genesis does not straightforwardly settle every question about the brothers' ages, so “Shem” is the safest textual answer to the naming question.