Across the world, 惟一 (Weiyi 
, 惟一 ) is quite a rare epicene first name. The forename 惟一 is characteristic of Singapore, where it is a rare epicene name, Hong Kong, where it is a rare girly name, and Australia, where it is a rare gender-neutral name. Not in comparison with a country's population, it most frequently occurs in China, the United States, and Singapore. Much less frequently, 惟一 is the last name as well as the forename.