“Mahavir Swami Thoy” in English means:

“Praise/Glory to Lord Mahavir Swami.”

If you want it in a more devotional style, you can say:

“I bow to Lord Mahavir Swami, the great Tirthankar, the victorious one who showed the path of ahimsa, truth, and liberation.”

If you need, I can also give the full English meaning line by line.