सिद्धार्थनगर (Hindi) comes from Hindi नगर, from Sanskrit नगर, from Sanskrit गर, from Sanskrit गुरु, from Proto-Indo-Aryan gr̥Húṣ, from Proto-Indo-Iranian gr̥Húš, from Proto-Indo-European gʷréh₂us, from Proto-Indo-European -us — Forms adjectives from Caland system roots.
Ancestry of “सिद्धार्थनगर”, step by step
सिद्धार्थनगर traces back through two separate lines of ancestry.