1. "Easterly": The most common belief is that "Osterly" refers to its location and means "easterly place" or "place located to the east". This is supported by the fact that Osterley Park, a famous house in London, is indeed located east of the city.
2. "Easternly": This interpretation is very similar to the first one, with "Easternly" referring to the direction rather than a place.
3. "East-facing": This interpretation suggests that the name refers to a place facing east, potentially due to a specific building or feature.
4. "Oster" + "ly": Some scholars speculate that "Oster" could be a personal name combined with the suffix "-ly" to indicate "place". This origin is less common and lacks strong evidence.
It's important to note that without further historical records or documentation, it's difficult to definitively pinpoint the original meaning of "Osterly". However, the most plausible interpretations point towards its connection to the direction "east" and its geographical location.