Returns a random person name

    Arguments:
      num_surnames -- number of surnames

def random_name(num_surnames=2):
    """
    Returns a random person name

    Arguments:
      num_surnames -- number of surnames
    """
    a = []

    # Prefix
    if random.random() < _PROB_PREF:
        a.append(_prefixes[random.randint(0, len(_prefixes) - 1)])

    # Forename
    a.append(_forenames[random.randint(0, len(_forenames) - 1)])

    # Surnames
    for i in range(num_surnames):
        a.append(_surnames[random.randint(0, len(_surnames) - 1)])

    # Suffix
    if random.random() < _PROB_SUFF:
        a.append(_suffixes[random.randint(0, len(_suffixes) - 1)])

    return " ".join(a)