käsu

Küüsu is a surname of Estonian origin. It is not a common surname, and its exact etymology is not widely documented. However, it is believed to be a derivative of a given name or a word related to the natural environment in Estonia.

Estonian surnames often have origins in given names, patronymics, occupational terms, or descriptions of physical characteristics or places. Without specific genealogical research, pinpointing the precise origin of Küüsu is difficult. It is possible that it originated from a place name or a personal characteristic.

As with many surnames, individuals bearing the Küüsu name are spread across Estonia and may have emigrated to other countries. Genealogical records and historical documents are the primary sources for tracing the lineage and history of specific families with this surname. Further research into Estonian onomastics and historical archives would be necessary for a more detailed understanding of its origins and distribution.