Aþalberht (Proto-West Germanic) comes from Proto-West Germanic berht, from Proto-Germanic berhtaz, from Proto-Germanic hrabnaz, from Proto-Indo-European ḱorh₂-, from Proto-Indo-European ḱer-, from Proto-Indo-European kr̥-, from Proto-Indo-European ker- — army.
Ancestry of “Aþalberht”, step by step
Aþalberht traces back through 3 separate lines of ancestry.