Where does “pláss” come from?

pláss (Icelandic) comes from Old Norse plaz, from Middle Low German platse, from Latin platēa, from Ancient Greek πλατεῖα, from Ancient Greek πλατύς, from Proto-Indo-European pléth₂us, from Proto-Indo-European pleth₂- — flat.

pláss (Icelandic): room, space