the said person; the same person; he/she
Formal, written-style noun used in news reports and official documents to refer back to a previously mentioned person without repeating their name. Gender-neutral; context determines whether it translates as 'he' or 'she'.
The said person announced the new policy at the press conference.
same surname
Rare, literal reading of the kanji; almost never used in modern Japanese outside of metalinguistic explanations or wordplay.
Taken literally, 同氏 means 'same surname', but it is almost never used that way in modern Japanese.
He stated that he would continue his research.
He and his colleagues explained the matter at a press conference.
同氏 simply refers back to a previously named person in formal writing, while 本人 stresses 'the person in question themselves' as opposed to someone else acting on their behalf.
同氏 is the standard formal term for referring back to a previously named person, while 同人 can technically mean 'the same person' but today almost always means 'like-minded people' or 'doujin' circles.
同氏 refers back to a previously mentioned person, whereas 同社 refers back to a previously mentioned company.
同氏 points back to a person already named, while 同国 points back to a country already named.
Compound of 同 (same) and 氏 (honorific suffix for a person, originally meaning 'clan' or 'family name'). The modern sense 'the said person' developed from formal written conventions.
According to him, a new product is scheduled to be released next year.