CREATE TABLE table_21090 ("Name" TEXT, "Latitude" TEXT, "Longitude" TEXT, "Diameter  ( km ) " TEXT, "Year named" FLOAT, "Name origin" TEXT)

Name the name origin for 54.0e
SELECT "Name origin" FROM table_21090 WHERE "Longitude" = '54.0E'
SELECT "Name origin" FROM "table_21090" WHERE "Longitude" = '54.0E'