WHOLE CHARACTER
认rèn
to recognize; to know (a person); to admit; to acknowledge (认可, 认账)
认 is to recognize — to know a face, admit a fact, and in 认真 to take things earnestly.
ZDIC's header names 人 as the sound side, while the traditional 認 used 忍 as its exact sound piece; modern 人 is kept separate from that historical identity.
MEANING
讠yán
speech (from 言)
The simplified speech form; not a standalone page.
In 认: meaning Shown with its documented or clearly limited role.
MODERN RIGHT PIECE (THE HEADER'S SOUND SIDE; THE TRADITIONAL SOUND WAS 忍)
人rén
person; people
Repeated in 众.
In 认: modern right piece (the header's sound side; the traditional sound was 忍) rén shares 认's initial r and final en with only the tone differing — modern resemblance, not the historical piece 忍.