It's only clever of course to have a nick which is both recognizable AND able to be spelled/repeated.
I find that when they are just too annoyingly difficult to replicate that I'll simply not bother to address that person by name....not an insulting action on my part but more a response to inconsiderate action on the part of the 'unpronouncable'.
Serious food for thought while attempting to be 'trendy'...