"Ardha" means "half" in Sanskrit. Since the full posture is difficult to be practiced, the half-posture, which is easier, is followed widely. This posture was first promoted by the great Yogi Matsyendranath, one of the founders of Hatha Yoga, and hence the name.
"Danda" means "stick" in Sanskrit.
"Dhanus" means "bow" in Sanskrit. In the final position of this asana, the body takes the shape of a bow, drawn tight to shoot an arrow. The stretched arms and lower legs resemble the taut bowstring, while the trunk and thighs resemble the wooden part of the bow.
"Matsya" means "fish" in Sanskrit. If a person lies steadily on water in this posture, he can keep floating on it easily like a fish without the help of the hands and legs, as the name of the asana suggests.
"Tri" means "three", "Kona" means "angle", and "Trikona" means "triangle" in Sanskrit The straight legs with the floor between the feet resemble the three sides of a triangle in this asana. Hence the name.
"Ushtra" means "camel" in Sanskrit.
"Veera" in Sanskrit means "brave". The way a brave man takes his position while attacking his enemy, the similar position is formed in this asana. Hence it is called as "Veerasana", the pose of a Warrior.