"Hala" means "Plough" in Sanskrit. This posture is called 'Halasana' because in the final position the body resembles the Indian plough.Sarvangasana - All-Parts Pose
"Shalabha" means "locust" in Sanskrit. The final position of this asana resembles a locust when it lowers its head to eat and raises its tail. Hence, the name.Sirshasana - Head stand
"Sirsha" means "head" in Sanskrit. It is required to "stand on his head" in this asana and hence the name.