I confess that such names are a little strange to me! We Eldar do not use ... I believe Master House called them 'surnames' - to identify each other. [ It helps that it is very, very rare to have an Elf with the same name as another ]

You take them after features in the lands you live in? [ For so it seems to him - he likes them, they are all very natural sounding - snow, water, flower ]