def surnameFill(person: str, previousPerson: str) -> str:
    """Correct abbreviation " characters by looking at the previous mentioned person. 
    
    Args:
        person (str): A person reference (i.e. " , Jan)
        previousPerson ([str]): A person reference (i.e. Jansz, Jan)
    
    Returns:
        str: A corrected person reference
    """

    surname, _ = previousPerson.split(',', 1)
    surname = surname.strip()

    person = person.replace('" ', surname, 1)

    return person