Language of Origin: Arabic
Abhá is a variation of Bahá. Bahá means glory, and Abhá is its superlative form. Both are titles of Baha'u'llah and His Kingdom.
‘Allah-u-Abha’ and ‘Ya Baha'u'l-Abha’ - invocations meaning, 'O Thou Glory of Glories' - both refer to the the Greatest Name of God, and both refer to Baha'u'llah. By Greatest Name, it is meant that Bahá'u'lláh has appeared in God's Greatest Name.