The type of macaroni that shares its name with a body part is "elbow macaroni." This pasta is shaped like a small elbow, which is also the name of the joint in the arm. Elbow macaroni is commonly used in dishes like macaroni and cheese.
neck
eyes
nail
Elbow
The eye, the skin
Arm
No; "macaroni" is probably derived from a Latin root (we get "macerate" from the same root), it isn't someone's name. Macaroni (the pasta) is probably an Arabic invention.
Teeth are the part of a body that is also the edge of a saw.
Tuna
limb
hare
limb