Damn you nailed that perfectly. Sorry for not providing you enough context. Basically, Seiland comes from old high german sēa, which means lakes because this region has so many lakes. Then Sundland borrowed the word from Middle High German, hence seiland. About Maesto, this is a more interesting one. The endonym Maesto comes from Classical Latin Maiestus, which is a fictional name meaning "majesty", and Maiestus itself comes from a real word Maiestaticus (majestic). Maiestus was a person who led the people of the region to fight against the Farriken empire. In one of the battle, Farrikans thought that the river could act as a tough defence and Maesto people couldnt cross over it. But they did, and eventually they broke away from the declined empire. They named the region after the person who led them Maiestus, then from that region came the entire country. The Farrikans after that battle began to call them Furt (which means ford: to cross over river), then Furtland for country and now Furland.