Answer

In Jain Āgamic language, Surya is commonly given as रवि (ravi). Jain scriptures are mostly in Ardhamāgadhī Prakrit, and Prakrit dictionary forms also show सूर्य-related words such as सुज्ज in compounds. ( jaina.org)

Explanation

If you mean the plain Jain Prakrit word for “Sun,” रवि is a standard equivalent. In some Āgama-related forms, you will also see सुज्ज / sūjja in words like सुज्जोदयो for sunrise. ( jainqq.org)

Takeaway

So, the simplest Jain Āgamic answer is: रवि.