These are Japanese-era names. What are they called today? I think Fumpo must be the same (or close to) Shuishe. Is Dairin the Japanese name for Ita Thao?
You learn something new everyday. I thought they wuz cartoon characters . 
Wikipedia has useful pages on Japanese-era names for much of Taiwan (see links in this section) – but not for Nantou. And I looked on a few maps from then but didn’t see either place. Maybe just try some more maps.
Dunno, but “ita thao” means “we people” in Thao. (“ita” being cognate to Indonesian “kita”)