If you mean the Navkar Mantra (Namokar Mantra), the core Jain prayer, here is its English rendering:

• I bow to the Arihants (the perfected souls who have conquered inner passions and have attained kevala jnana).
• I bow to the Siddhas (the liberated souls who have destroyed all karma).
• I bow to the Acharyas (the spiritual leaders who uphold and teach the Jain path).
• I bow to the Upadhyayas (the teachers who guide monks and lay followers).
• I bow to all Sadhus (monks and nuns) and to all the Chaturmanggis (monastic orders) who help in the propagation of the true path.

Original (transliterated Prakrit/Sanskrit form): Namo Arihantanam Namo Siddhànam Namo Ayariyanam Namo Uvajhayanam Namo Loe Savva Sahunam Asevisva (or Anukāṣikā) — meaning: May I have the fortune of knowing and following the true path; may I never turn away from the right conduct.

Notes:

• This mantra is central and widely recited in both Digambar and Shwetambar traditions.
• It is a declaration of reverence to the fivefold aspects of Jain spiritual attainment and guidance.

If you meant a different Jain prayer by “jain nammothanam,” please specify the exact name or text, and I’ll provide the English rendering and meaning.