def df_name_multiindex(df, name):
    """
    Rename columns of a DataFrame by using new column names that
    are tuples of (name, column_name) to ensure unique column names
    that can also be split again. This transforms the columns to a MultiIndex.
    """
    d = {}
    for c in df.columns:
        d[c] = name, c
    return df.rename(columns=d)
