USN - driven backwards ?
or with the help of Google
US Automobile (USA, 1899-1901)
Union (USA, 1902-1905)
Unic (France, 1904-1939)
U-Wagen (Austria, 1919-1923)
Unipower (UK, 1966-1970)
UNO (Sweden, 1980s)
But must confess to have never heard of any of them...