point to the person you are talking to= you
twist your fists on over the other as if using a pepper grinder= make
point to yourself= me
open palms toward your chest and move them in a circle towards your body=happy
point back to the person you are talking to as a sign that it is their turn to speak.
To sign "Are you happy?" in American Sign Language, you would sign: YOU HAPPY? with raised eyebrows.
No person has an existing name in Sign Language. A deaf person is supposed to give it to them. For example, if you are happy, this particular person would probably say your name is "Happy" with a K.
You make an I in sign language and then point to your head and then nod.
You can't speak sign language but you can "sign".
I am happy can be translated into Kikuyu language as de mukenu.