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tena nirvRttam

तेन निर्वृत्तम् ONPANINI 42068

The /cAturarthika affixes may mean "completed by him".

So you don't have to be the one that starts to build a city to get it named after you — finishing the job is what matters:

kuzAmbena nirvRttA nagarI sA kauzAmbI nagarI
कुशाम्बेन निर्वृत्ता नगरी सा कौशाम्बी नगरी
"the city finished by kuzAmba कुशाम्ब is called kauzAmbI कौशाम्बी city".

kuzAmbena कुशाम्बेन + nirvRttA निर्वृत्ता
→ kuzAmbena कुशाम्बेन + /aN'' + /GI
→ kauzAmbI कौशाम्बी