The variant spelling Allison is the most common form in the United States.
[5] In 1990 in the United States, Allison was the 228th most popular name for women of all ages; Alison was #347, Allyson, #775; Alyson, #981; Allie, #764; Ali, #2434; and Alice, #51.
[6] Alison in any spelling did not enter the top 100 baby names in 2005 in England and Wales.
[7] Allison last entered the top 1000 baby names for males in the United States in 1946, when it ranked #968.
[8] In Lusophone countries like Brazil and Portugal, Alison and variant forms are also used as masculine given names.