Jira was initially released in 2002, and is a bug tracking and project management tool developed by Atlassian, a Sydney, Australia-based IT company.
According to the company, Atlassian originally used Bugzilla for internal bug tracking. The company’s developers referred to Bugzilla as Gojira, the Japanese name for the beast we know as Gozilla.
When Atlassian began developing its own bug tracking software, they dropped the “Go” part and named it Jira.
As an interesting aside, the name Gojira is actually a portmanteau of gorira (ゴリラ or gorilla) and kujira (クジラ or whale).