"Blend of Brandy and Lynn"
The name Brandalyn is commonly a female name.
Brandalyn is a modern American blend of a Brand- element, as in Brandy and Brandi, with the -lyn ending used in American girls' names. US birth records first show it in 1969, which fits a name assembled from existing name parts rather than one inherited from an older language. The a in the middle of the spelling matches the form Branda rather than Brandy.
The pronunciation of Brandalyn is BRAN-duh-lin.