Answer

The monk most clearly known to have been in Sindh in the second half of the 12th century AD is Jinadatta Suri (also called Dadaji). A Jain source describes him as journeying into Sindh, and another medieval Jain account lists Uchchha (Sindh) among the places he visited. ( dokumen.pub)

Explanation

Jinadatta Suri was a major Kharatara Śvetāmbara acharya, active in the 12th century. In the material I found, the Sindh-specific reference is strongest for him. The same broader tradition also speaks of Jinachandra Suri and Jinapati Suri as important 12th-century Kharatara monks, but I did not find as clear a Sindh reference for them in the sources I checked. ( jainworld.com)

Takeaway

So, if you want the single clearest name, it is Jinadatta Suri. ( dokumen.pub)