Amsterdam, Netherlands

We know that 'pelican' comes from ancient Greek. The sources posit its etymology from 'axe.' How likely is that? These are water birds, so it seems far more likely that it comes from the word for 'sea,' pelagos, literally the landscape that is spread out. That would apply to any placid water, fresh or salt. From pelagos we get pelican. What do you think? [2015]