header_font_name
Description:
Name of the font used to print page header.
If this property is unspecified, the text body font is used.
Accepted values are strings representing a font description Pango can understand. (e.g. "Monospace 10"). See font_description_from_string for a description of the format of the string representation.
The value of this property cannot be changed anymore after the first call to the paginate function.