in his own right is an adverb meaning "by title vested in yourself or by virtue of qualifications that you have achieved". It carries one recorded sense.
by title vested in yourself or by virtue of qualifications that you have achieved
“a peer in his own right”
“a leading sports figure in his own right”
“a fine opera in its own right”
“she's a rich woman in her own right rather than by inheritance”
“an excellent novel in its own right”
Definitions, synonyms and semantic relations for in his own right come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.