JIRA's issue cloning behaviour can be modified by JIRA system administrators.

Configuring cloned issue linking behaviour

By default, when an issue is cloned, JIRA will automatically create a link between the original and cloned issue using the pre-existing link type name 'Cloners'.

You can change this default behaviour by editing the jira.clone.linktype.name property of your jira-config.properties file.
(info) If this property does not exist in your jira-config.properties file, add it to the file.

Configuring the cloned issue summary field prefix

By default, the 'Summary' field of a cloned issue is prefixed with the string 'CLONE - ' to indicate that the issue is a clone.

To change this prefix or prevent the addition of prefixes on cloned issues:

  1. Access JIRA's Advanced Settings page. (See Configuring Advanced Settings for more information.)
  2. Edit the value of the jira.clone.prefix property by clicking the existing value and specifying a different prefix for the 'Summary' field of cloned issues.
    (info) Specifying no value prevents a prefix being added to the 'Summary' field of cloned issues.
  3. Click the 'Update' button to save the new value in the JIRA database.