Surname สายไฟ (Wires 
, Cordes 
, สายไฟ 
) , globally, is a common last name. The family name สายไฟ is characteristic of Germany, where it is quite a common surname, Denmark, where it is quite a rare surname, and Netherlands. In absolute terms, the name is most common in Germany, the United States, and Netherlands. Very seldom, สายไฟ is the forename as well as the last name.