Regarding the meaning of the surname Intihar (Indihar).
It's pretty impossible that the surname is of the Turkish origin, for many reasons (like: the meaning "suicide" is too awkward for a surname, people coming to a territory of present day Slovenia from Ottoman Empire weren't ethnically Turks, but neighbouring Croats, Serbs or Bosniaks with respective first names and surnames).
Intihar is a pretty common surname in Slovenia, but without an apparent etymology; the meaning of most Slovenian surnames is evident for a native speaker, but not in this case. The surname looks like not having a Slovenian (or even Slavic) etymology, so in all probability it is originally a foreign surname (German, maybe Hungarian?). But it's hard to establish the source, as this surname is probably a "corruption" of an original foreign source (a corruption in sense that the surname changed/adapted to Slovenian language through centuries).