As per the standard Jain lists of nirvana / siddha kṣetras (like Nirvāṇa-kāṇḍa, Tīrtha‑kalpa etc.), Lakhnadon is not mentioned as the place of nirvana of any of the 24 Tirthankaras, nor of any other widely‑known kevalī whose name is traditionally recited.

Modern local usage sometimes calls a place “Siddha Kshetra” either:

• because a revered muni is believed locally to have attained nirvana there, or
• as an honorific along with “Atishay Kshetra” for a site where great miracles or spiritual events are believed to have occurred,

but I could not find any authoritative traditional Jain text that clearly states which specific soul attained nirvana at Lakhnadon.

So, with the authentic sources available, I cannot reliably name any particular Tirthankara or muni as having attained nirvana from Siddha Kshetra Lakhnadon.