Add Prefix or Suffix to attribute names in joined dataset?

Hi. I am joining 2 datasets into a single dataset. As each dataset has many attributes with odd names, I would like to distinguish in my final joined dataset the source of each attribute. I would like to add a prefix onto the attribute names in my final joined dataset identifying the original source of the attribute (for example, datasetA_att1, datasetB_att2, and so on).

Is there a way to do this without having to rename each individual attribute? My final joined datsaset has over 2000 attributes.

Thanks in advance for any advice-

Tim