"Chakra" means "wheel" in Sanskrit. In the final position of this asana, the body is arched backward and resembles the rim of a wheel. Hence the name.
"Danda" means "stick" in Sanskrit.
"Sirsha" means "head" in Sanskrit. It is required to "stand on his head" in this asana and hence the name.
"Sukha" means "pleasant" or "comfortable" in Sanskrit. Any cross-legged sitting position which you find comfortable, in which the body does not shake and in which you can remain at ease for a long time, is called Sukhasana.
"Ut" means 'raised' and "kata' means "hips" in Sanskrit. This posture is known as "Utkatasana" because while practicing it, the heels and hips are raised.
"Vriksha" means "tree" in Sanskrit. In the final position of this asana, you have to stand still like a tree.