幾いくばく

• 幾いくばくUsage20%

  Mixed kanji-kana spelling; usually written in kana.

• いくばくUsage72%

  Kana spelling is the most common and recommended for learners.

• 幾許いくばくUsage8%

  Full kanji form; rarely used in modern writing.

• 幾何いくばく
  rarely-used kanji form

  Rarely used kanji form; easily confused with 幾何 (きか, geometry).

Compound of 幾 (iku, 'how many') + ばく (baku, an old suffix indicating amount or degree). The suffix ばく is of uncertain origin but appears in classical Japanese.