The word "asexnal" does not have an established etymology as it appears to be a misspelling or a made-up term. However, if you meant the word "asexual", the etymology is as follows:
The term "asexual" is derived from the prefix "a-" meaning "without" or "lacking" and the word "sexual". The word "sexual", in turn, comes from the Latin word "sēxuālis", related to "sēxus" (gender), which ultimately traces back to the Indo-European root "seks-", meaning "to cut" or "to divide". This connection may stem from the concept of sexual reproduction, where organisms divide or cut themselves in half to reproduce.