Globally, Piirsoo (Piirsoo 
) is an extremely rare unknown gender first name. Predominantly, Piirsoo is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Piirsoo | United States, Estonia, Finland |
| alla piirsoo researcher (ORCID 0000-0001-6843-7127) |
|