1
Hello, my name is Sarah.
Sign "HELLO", then point to yourself with your index finger (D handshape). Next, tap your dominant horizontal U handshape over your non-dominant U handshape twice for "NAME", and finally fingerspell S-A-R-A-H.
2
Nice to meet you, my name is John.
After signing "NICE MEET YOU", point to your chest with your index finger. Follow this with the "NAME" sign using your intersecting U handshapes, and then clearly fingerspell J-O-H-N.
3
My name is Alex; what is your name?
Point to yourself, sign "NAME" by tapping your U handshapes together, and fingerspell A-L-E-X. Then, point to the person you are talking to and sign "NAME" again while furrowing your eyebrows to ask the question.