The meaning of the name Alanna is Little Child. The origin of the name Alanna is American. This is the culture in which the name originated, or in the case of a word, the language.
From Irish. Or from the name ALAN
Alanna is on 3,397 BN name lists Alanna is currently #68 on the BN charts Alanna is currently #543 in U.S. births
Alanna 
