こめかみ

• こめかみUsage90%

  Standard kana spelling; the word is usually written in kana.

• 顳顬こめかみUsage7%
  rarely-used kanji form

  Rare kanji form; the characters specifically refer to the temple region.

• コメカミUsage4%
  kana-only spelling

  Katakana spelling, sometimes used for emphasis or in informal writing.

• 蟀谷こめかみ
  rarely-used kanji form

  Rare kanji form; the characters are ateji for the temple.

• 顳こめかみ
  rarely-used kanji form

  Rare single-character kanji form for the temple.

Probably from 米噛み, “rice-chewing,” referring to the visible movement at the temple when one chews. The historical spelling and derivation are not entirely certain.