Alannah \a-lannah, al(an)-nah\ as a girl's name is pronounced ah-LAH-nah. It is of Old German origin, and the meaning of Alannah is "precious". Variant spelling of Alanna (see Alana), possibly influenced by names of Hebrew origin such as Hannah and Susannah, and by the Anglo-Irish term of endearment "alannah" or "a leanbh" meaning "O child".

Baby names that sound like Alannah are Alanah, Alaynna, Alayna, Alaina, Alonna, Allinah, Aleynah, Alawna, Alynah, Allynah, Alenah, Elanna and Elanah. Other similar baby names are Adanna, Liannah, Leannah, Lannah, Alanza, Annah, Ayanna, Flanna and Luannah.