```python
from typing import List

def oxford_join(names: List[str]) -> str:
    if not names:
        return ""
    elif len(names) == 1:
        return names[ 0]
    elif len(names) == 2:
        return f"{names[0]} and {names[1]}"
    else:
        return ", ".join(names[:-1]) + f" and {names[-1]}"
```