Janica is diminutive of
JanaSlavica is diminutive of Slava, which indeed means glory
Ivica is diminutive of
Ivan.
Marijan is probbably male form of Marijana, which is composed of two names
Marija and
Ana.
In Croatia there is a lots of names that are actually diminutives of the original names. That is why sometimes male and female names sound similar like Ivica (m) and Janica (f). Those are the names of famous croatian olympic gold medalist and her brother.
Nana