How to Sign "Last Name"
The sign for 'last name' is a combination of two signs: 'last' and 'name'. First, make 'I' handshapes with both hands by extending only your pinky fingers. Hold your non-dominant hand out, and strike its pinky with the pinky of your dominant hand as it moves downward. Then, immediately change both hands to 'H' handshapes (index and middle fingers extended together). Tap the fingers of your dominant hand crosswise over the fingers of your non-dominant hand twice.