The TenantID column in a Workspace with KQL is actually the Workspace ID (look at your Workspace Settings). There is a AAD tenantID value in the Auditlogs as well
As far as I know its not achievable in KQL (you can do this in a Workbook using ARG and KQL), or with a Playbook to populate a Table that holds data as a lookup? Also maybe consider a datatable or a Watchlist if there are just a few to lookup?
// this has both GUIDs but no name either
| project AADTenantId, TenantId