Variants of name
- Caucasus Indicus
- Lohitagiri /Lohitāgiri (लोहिता गिरि) (old name of Hindukush)
- Rohitagiri (रोहित गिरि) 
Origins of the name
The origins of the name "Hindu Kush" are uncertain, with multiple theories being propounded by different scholars and writers. Hindu Kūh (ھندوکوه) and Kūh-e Hind (کوهِ ھند) are usually applied to the entire range separating the basins of the Kabul and Helmand rivers from that of the Amu River (ancient Oxus) or more specifically to that part of the range, northwest of the Afghan capital Kabul. Sanskrit documents refer to the Hindu Kush as Pāriyātra Parvata (पारियात्र पर्वत).
The mountain range was called "Paropamisadae" by Greeks in the late first millennium BC. In the time of Alexander the Great, they were further referred to as the Caucasus Indicus or "Indian Caucasus", which past authors have additionally considered as a possible derivation of the name "Hindu Kush".
The highest point in the Hindu Kush is Tirich Mir (7,708 m or 25,289 ft) in Chitral District of Khyber Pakhtunkhwa, Pakistan.
हिन्दूकुश - इस पर्वत का नाम महाभारतकाल में तुषारगिरि था जो कि इस क्षेत्र पर तुषार गोत्र के जाटों का शासन होने से उनके नाम पर ‘तुषारगिरि’ कहा गया। बाद में मुसलमानों के समय में इस पर्वत का नाम हिन्दुकुश पड़ गया, जिसका ब्यौरा निम्नलिखित है -
हिन्दुकुश अपभ्रंश है इन्दुकुश का। इन्दु चन्द्रमा और कुश = मारना, अर्थात् जहां पर चन्द्रवंशीय श्रीकृष्ण जी के वंशज महाराज सुबाहु, रिझ, गज, शालिवाहन और बलंद ने मुसलमानों से भीषण युद्ध किये थे, इसीलिए उस देश के पहाड़ों की पंक्ति को इन्दुकुश या हिन्दुकुश कहते हैं।
Mention by Panini
[p.435] Evidently this parvata region must have been outside the plains of the Vahika Country, which brings us to the highlands of north-west as the homeland of the ayudhajivins. The Kashika mentions Hrdgoliyas Hridgola, probably Hi-lo of Yuan Chwang (modern Hidda south of Jalalabad); Andhakavartīyāḥ of Andhakavarta, perhaps Andkhui, a district in the north-east Afghanistan and Rohitagiriyas of Rohitagiri, which last is important as reminiscent of Roha, old name of Afghanistan. All this portion of the country is up to the present day peopled by hardy and warlike Mountaineers.The Markandeya Purana refers to mountain-dwellers of the west, including such names as Nihāras (Nigrahāra of Vayu, same as Nagarahāra or Jalalabad where Hṛidgola or Hiḍḍā is situated) and the Haṁsamārgas (modern Hunza in the north of Dardistan). Thus country of mountaineers extended from Kashmir to Afghanistan and most of the people settled in these mountains and their valleys were of the Ayudhajivin class. The Bhishmaparva specially mentions Girigahvaras (गिरिगह्वर) (VI.10.66), dwellers of mountain caves, as a people of the north-west (Bhishmaparva, 9.68, Udyogaparva, 30.24), and this epithet appropriately applies to the tribes of the north-west. They were the same as Sanghah girichāriṇaḥ and girigahvara-vasinah (Dronaparva, 93.48).
Arrian mentions these mountainous Indians as fighting in the army of Darius against Alexander at Arbela (Anabasis, III,8.3-6). It was these Parvatiya Ayudhajivin that offered stout resistance to Alexander in Bactria and Gandhara.
The approximate location of these Parvatiyas should be sought for in the region of the Hindukush on both sides of it. Roha, of medieval geographers, Rohitagiri of Panini, the ten Mandalas of Lohita (Sabhaparva, 24.16) and Rohitagiriyas of Kashika, all together point to the mountainous regions of the central and north-east Afghanistan as being the Parvata Country, which name survives in Kohistan.
Alexander the Great explored the Afghan areas between Bactria and the Indus River after his conquest of the Achaemenid Empire in 330 BC. It became part of the Seleucid Empire before falling to the Indian Maurya Empire around 305 BC.
Alexander took these away from the Persians and established settlements of his own, but Seleucus Nicator gave them to Sandrocottus (Chandragupta), upon terms of intermarriage and of receiving in exchange 500 elephants. ( —Strabo, 64 BC–24 AD)
Before the Christian era, and afterwards, there was an intimate connection between the Kabul Valley and India. All the passes of the Hindu-Kush descend into that valley; and travellers from the north as soon as they crossed the watershed, found a civilization and religion, the same as that much prevailed in India. The great range was the boundary in those days and barrier that was at time impassable. Hindu-Kuh--the mountain of Hind--was similarly derived.
In Kishkindha Kanda Sarga 42 (Ramayana) Sugreeva sends troops to west side to search for Sita under the leadership of Sushena, the father of lady Tara. Describing the various provinces like Surashtra, Balhika and Chandrachitra (Mathura), Western Ocean, River Sindhu and magnificent mountains including Pariyatra that are situated at the northwest of India, cities like Murachi, Jatapura, Avanti and Angalepa and also the ocean down south to it, namely the present Arabian Sea and almost up to Persian provinces, he orders monkey troops to return within one month's time.
- "On your seagoing there, oh, vanara-s, you will see the golden peak of a waterlogged mountain called Mt. Pariyatra (पारियात्र), which peak will be hundred yojana-s in height, and which is difficult to see as it will be blindingly glittering. (4.42.19b, 20a)
- Twenty four crores of mighty and atrocious Gandharva-s whose glow is similar to the fire and who can change their guise at their wish are living there on that mountain Pariyaatra. (4.42.20b, 21)
- कोटिम् तत्र समुद्रे तु कांचनीम् शत योजनम् ॥४-४२-१९॥
- दुर्दर्शाम् पारियात्रस्य गता द्रक्ष्यथ वानराः ।
- कोट्यः तत्र चतुर्विम्शत् गंधर्वाणाम् तरस्विनाम् ॥४-४२-२०॥
- वसन्ति अग्नि निकाशानाम् घोराणाम् काम रूपिणाम् ।
- पावक अर्चिः प्रतीकाशाः समवेताः समन्ततः ॥४-४२-२१॥
- V. S. Agrawala: India as Known to Panini, 1953, p.39
- V. S. Agrawala: India as Known to Panini, 1953, p.40
- Jat History Dalip Singh Ahlawat/Chapter IV (Page 338)
- V. S. Agrawala: India as Known to Panini, 1953, p.39,511
- V. S. Agrawala: India as Known to Panini, 1953, p. 40, 41
- V. S. Agrawala: India as Known to Panini, 1953, p.435
- V. S. Agrawala: India as Known to Panini, 1953, p.40
- V S Agarwal, India as Known to Panini,p.434-435
- Nancy Hatch Dupree / Aḥmad ʻAlī Kuhzād (1972). "An Historical Guide to Kabul - The Name". American International School of Kabul. Retrieved 2010-09-18.
- Houtsma, Martijn Theodoor (1987). E.J. Brill's first encyclopaedia of Islam, 1913-1936 2. BRILL. p. 159. ISBN 90-04-08265-4.