Purandar (पुरन्दर) is a Sanskrit name used in Jain texts as a respectful epithet. In Jain usage, it conveys the sense of someone who is invincible or unconquerable—one who is supreme, fearless, and firm in virtue. The exact nuance can vary slightly between Digambara and Śvetāmbara contexts, but the core idea is that of strength, steadfastness, and sovereign worth.

If you’d like, I can provide a short Jain-stotra or verse where this name appears, with its arth (meaning) explained in that context.