def get_client_names(worksheet) -> list:
    """Get list of client names from Excel worksheet."""

    num_rows = worksheet.max_row
    names = []
    for i in range(2, num_rows+1):
        cell_obj = worksheet.cell(row=i, column=1)
        if cell_obj.value not in names:
            names.append(cell_obj.value)

    return names