complete denial of knowing (an incident in question)

to know through one's own experience

to have no way of knowing; to be completely ignorant of

to make known

(Classical Japanese, archaic, honorific) to know

God only knows

A person whose name has become identified with a particular object or activity; eponym.

(literary) an alternate name

(computing) a filename

to give one’s name (as), to call oneself (name, etc.) / to impersonate or claim to be (someone)