I am not so sure that
Tomislav is the same name as
Thomas. Here is my theory. I think that croatian variant of
Thomas is
Toma - somewhat arhaic name today, but I know for sure that it exists, because it was my great-grandfather`s name(and he was croatian).
Tomislav on the other hand is different name, althought it is derived from
Thomas (or
Toma) and it means glory of
Thomas = Tomi(a) + slav (glory).
Next time you post nasty remarks about other people, remember that you are not the only one here who understands croatian.