Smith, Johnson, Williams, Brown and Jones remained the most common last names in the United States , unchanged from a decade earlier, but Census Bureau data show that Asian surnames were the fastest‑growing at the start of this decade. The figures come from the 2020 Census released Tuesday, which tallied last names nationwide as part of the once‑a‑decade head count. While the top rankings remained largely stable, the data highlight demographic shifts reshaping which names are rising fastest