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The OpenType spec is fairly clear that fullname should be constructed from family and style. And the default convention is family space style, except for the default Regular for which fullname = family.

Name ID 4

Full font name that reflects all family and relevant subfamily descriptors. The full font name is generally a combination of name IDs 1 and 2, or of name IDs 16 and 17, or a similar human-readable variant.

For fonts in extended typographic families (that is, families that include more than regular, italic, bold, and bold italic variants), values for name IDs 1 and 2 are normally chosen to provide compatibility with certain applications that assume a family has at most four style-linked fonts. In that case, some fonts may end up with a Subfamily name (name ID 2) of “Regular” even though the font would not be considered, typographically, a regular font. For such non-regular fonts in which name ID 2 is specified as “Regular”, the “Regular” descriptor would generally be omitted from name ID 4. For example, the Arial Black font has a Font Family name (name ID 1) of “Arial Black” and a Subfamily name (name ID 2) of “Regular”, but has a full font name (name ID 4) of “Arial Black”. Note that name IDs 16 and 17 should also be included in these fonts, and that name ID 4 would typically be a combination of name IDs 16 and 17, without needing any additional qualifications regarding “Regular”.

Please apply the spec strictly in fontconfig and do not relay machine-level Postscript names or the other kind of mess font authors put in their files.