This is actually a fork of Rhodecode. This[0] changeset has most of the changes from Rhodecode to Kallithea. The repo contains the full commit his to Marcin Kuzminski's first commit of RhodeCode[1].

Also the name relates to RhodeCode: Kallithea, or Καλλιθέα, is the name of a locality on the island of Rhodes

[0] https://kallithea-scm.org/repos/kallithea/changeset/24c0d584...

[1] https://kallithea-scm.org/repos/kallithea/changeset/564e4082...