CREATE TABLE table_203_573 (id DECIMAL, "name" TEXT, "rank - 2000" DECIMAL, "number" DECIMAL, "country of origin" TEXT, "england - 2001" TEXT)

which surname on the list belongs to the smallest number of people ?
SELECT "name" FROM table_203_573 ORDER BY "number" LIMIT 1
SELECT "name" FROM "table_203_573" ORDER BY "number" NULLS FIRST LIMIT 1