It is also a related form of the name "Hannah" Hebrew: means "God has been gracious: or God has shown favor". My daughter's name is Alayna, and it suits her beautifully. She is the only Alayna I know, and, yes she is definitely one of a kind!
The origin of the name is originally Irish and has many meanings: "beautiful, fair, peaceful, offering, and precious". Other variations of the name are: Alaynah, Alleynah, and Alleyna. This is by far my most favorite female name.