Display name
Long time ago, before Geni introduced all those additional fields, we only had Name, Surname, Display name. We were using this field a lot as there was no much else you could do to show all the variations in a person's name.
BUT - this is no longer the case.
Since then, Geni added prefix, Suffix, Multilingual fields (almost unlimited number of fields), additional labels and so on..
Some of our users still use it and in most cases does not do any harm, BUT lately I have been encountering cases where this is really problematic.
Shortening names and surnames, creating names which are unrecognizable.
Croatian name don't have first and middle name, all names are equally important. Deciding to create a display name by randomly choosing one of the given names is not helping. Families often had children with the same name - Ante Ivan, Ante Santo, Ante Marko could have all been siblings. Deciding that one of those names is more important than the rest is wrong. PLEASE DONT DO IT, at least not on profiles you share with others.
Same goes for surnames - many places on Dalmatian coast, used multiple surnames. for example Mrkušić Kurtić - this is a single surname - there is no part of this surname more important than the rest. People who are related to this family will know - you cannot shorten this surname into the single one.
So be careful with a display name, if you are not certain, dont use it, leave the name as it is. DONT USE IT AT ALL.