奈な良ら時じ代だい

• 平へい安あん時じ代だい

  The Heian period (794-1185 CE) followed the Nara period, with the capital moved to Heian-kyō (Kyoto).

• 飛鳥あすか時じ代だい

  The Asuka period (592-710 CE) preceded the Nara period, known for the introduction of Buddhism and the Taika Reforms.

• 奈な良ら時じ代だい

  Standard modern spelling for the Nara period.

• 平城なら時じ代だい
  rarely-used kanji form

  Rarely used kanji form; 平城 is an old name for Nara.

• 寧楽なら時じ代だい
  rarely-used kanji form

  Rarely used kanji form; 寧楽 is an old name for Nara.

From 奈良 (Nara, the capital city) + 時代 (period, era). The name Nara itself is of uncertain origin, possibly from the verb ならす (to flatten) referring to the flat land, or from the Korean word nara (country).