- Bang Sai (บางไทร), the district with geocode 1404, is pronounced with a short ai (in English the same as in the word I) at end. The name means "Banyan tree village".
- Bang Sai (บางซ้าย), the district with geocode 1413, is pronounced with a long ai sound at end. The name means "left village" - don't know what left side is meant by the name.
Going down one administrative level, there strangely is just one case where two subdistricts within one district share the same romanization - in Fang district there are two subdistricts named Mae Kha, one with a short a and one with a long one. For villages however, it is quite common to have more than one village with the same Thai name within one subdistrict, which is no big problem since the villages are more often identified by their number than by their name.
For municipalities, it gets much more confusing, as there are cases of two municipalities with the same Thai name in one district, which only differ by the municipal level, so only when using name and administrative status together the name becomes unique. I will write a separate blog post on those cases later.