I don't know if you'd find this of any use, but my ancestors came from friesland in the north of holland. Nowadays there are no dates left there. However, there are a few in denmark and branches in the us, australia, canada, barbados and argentina. Some individuals named dates live in the uk and germany. From the information i have collected througout the years, dates must be a frisian name, that is from northern holland and germany and spread from there to the rest of the world, including the us.