Is there any option for Konversation to not display your name? Recently changed to it (been using KVIRC before) and I can't say I'm amused by it spamming my name into channels when leaving the channel.
In my opinion no app should make any of your personal info publically available without explicit conscent, especially if the information is from the system information rather than anything you have given the app itself manually access to.

[edit]
Probably found it, Settings > Identities