posthumous (real) name
諱 centers on a name given after death, specifically a posthumous or taboo personal name used to avoid speaking the true name of a deceased person.
諱 combines 言 (speech, words) with 韋, which likely contributes the sound. The character relates to the practice of avoiding a deceased person's true name in speech.
Words (言) are used to avoid the real name, represented by 韋, which looks like a wrapped or hidden thing. Think of a taboo name wrapped in silence, only spoken indirectly.
For キ, imagine a key (キー) that unlocks the hidden posthumous name: key -> キ, and the words (言) reveal the secret name.
real name (of a deceased person or a noble)
one kanji in the name of a nobleperson (with a multiple-kanji name)
(for a nobleman) to bestow one of the kanji in his name upon someone (e.g. meritorious retainer, boy coming of age, etc.)
posthumous name
displeasure; offense; offence; disliking
to give offense; to get on someone's nerves; to displease
semicentennial memorial service
avoiding using a name (naming taboo in ancient China)