There's no immediate way to tell. The names should be evocative of the clan type (your Bent Tree is a hills clan - admittedly not entirely clear, but I'm imagining rocky, scrubby hill pine), and the icon is linked to the name. There's a little system - rocks, hills, stone = hills. Storms, sky = rover or chariot. Certainly all the sea clans are named something nautical. But the Fire Ants (jungle)? The Setting Suns (hills)? There are about five clan names per clan type, so after a few games you should be able to identify them. We toyed with using historical names (Moken, Bugis, Woku at sea; Jurchen, Hun, Xiongu on horseback; Wa, Picts, Tamang in the hills), but balked at identifying even historical peoples with the category of "barbarian." The geographic/animal feature seemed to fit more with the "Carlbarian" idea rather than actually creating thirty new "mini-civs" (there is a lot involved in researching/clearing civ choices). But we still wanted to have a bit of personality, so it's not just going to be "HILL DUDES"