I’ll answer your questions one by one in simple form.

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1. Why the name “Neminath” / “Arishtanemi”?

Bhagwan Neminath is the 22nd Tirthankar. His original name was Arishtanemi.

• In Jain tradition, “Nemi” means the rim of a wheel (chakra).

Just as the rim of a wheel cuts through obstacles, Dharm‑chakra cuts the tree of sins.

• “Nath” means Lord.

So Neminath = “Lord of the (Dharm)‑wheel” – the one who protects and supports Dharma.

According to Jain texts, when he was in his mother’s womb, she saw a divine jeweled wheel (Ratna‑chakra) in her dream. From this auspicious dream, he was named Arishtanemi, and later known as Bhagwan Neminath.

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2. Where was Bhagwan Neminath born?

• He was born in Sauripur / Sauripuri / Suryapur (also called Shauripur or Kushavarath desh in different traditions).
• Father: Raja Samudravijay
• Mother: Rani Shivadevi
• Vansh: Yadu / Harivansh (Yadav dynasty)
• He was a cousin of Shree Krishna (both from the Yadav family). ( jainknowledge.com)

You can read a short description connected to Neminath Bhagwan here

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3. Where did he attain Nirvana (Moksha)?

Bhagwan Neminath attained Keval‑jnan and finally Nirvana on Mount Girnar (also called Revataachal / Revathgiri) near Junagadh (Gujarat). ( jainknowledge.com)

Because of his Nirvana there, Girnar is a very important Siddha‑kshetra for Jains. You can read more about Girnar as Neminath Bhagwan’s Moksha‑bhumi here

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4. Why is the conch (shankh) used as his lanchhan?

Every Tirthankar has a special symbol (lanchhan) so that:

• We can easily recognize which Tirthankar the idol represents.
• Even after many time‑cycles, when many idols exist, the lanchhan keeps the identity clear.

For Bhagwan Neminath, the lanchhan is the conch (shankh). ( jainknowledge.com)

In Jain understanding:

• The conch is an auspicious symbol.
• Its spiral form and “sound” (traditionally) are taken to remind of the spreading of true Dharma in all directions, like the updesh (teaching) of a Tirthankar.
• So the shankh became fixed in the tradition as the permanent identifying symbol of the 22nd Tirthankar, Neminath Bhagwan.

Thus, whenever you see a Jina idol with a conch (shankh) mark on the base or near the feet, you can know: “This is Bhagwan Neminath (Arishtanemi).”