Last name シオ (Sio 
, Shio 
, シオ ) , around the globe, is a common family name. The last name シオ is habitual in Macao, where it is a common surname, Georgia, where it is quite a common surname, and Tanzania, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Tanzania, Japan, and Macao. Likewise, シオ is the forename as well as the last name.