stakker (Old Swedish) comes from Old Norse stafkarl, from Old Norse Karl, from Proto-Norse ᚲᚨᚱᛁᛚᚨᛉ, from Proto-Germanic karilaz, from Proto-Germanic karaz, from Proto-Indo-European ǵerh₂- — to grow old, to mature.
Ancestry of “stakker”, step by step
stakker traces back through two separate lines of ancestry.