𑀤𑁂𑀓𑁆𑀔𑀇

Etymology tree

Proto-Indo-European *derḱ-

Sanskrit दृश् (dṛś)der.

Proto-Indo-European *per-

Proto-Indo-European *pró

Proto-Indo-European *pro-

Proto-Indo-Iranian *pra-

Sanskrit प्र- (pra-)

Proto-Indo-European *h₃ekʷ-

Proto-Indo-European *-s

Proto-Indo-European *h₃ókʷsder.

Sanskrit ईक्ष॑ते (ī́kṣate)

Sanskrit प्रेक्ष॑ते (prékṣate)influ.?

Ashokan Prakrit 𑀤𑁂𑀔𑀢𑀺 (dekhati)

Prakrit 𑀤𑁂𑀓𑁆𑀔𑀇 (dĕkkhaï)

Turner suggests that -e- developed from analogy with Sanskrit प्रेक्षते (prekṣate, “to see”), which is from प्रेक्ष् (prekṣ, “to look, regard”), a compound of प्र- (pra-) + ईक्ष् (īkṣ, “to see, look”).

𑀤𑁂𑀓𑁆𑀔𑀇 (dĕkkhaï) (Devanagari देक्खइ) ^[1]^[2]

Central Indo-Aryan:
- Awadhi: देखब (dekhab)
- Braj: देखन (dekhan)
- Hindustani:
  - Hindi: देखना (dekhnā)
  - Urdu: دیکْھنا (dekhnā)
Eastern Indo-Aryan:
- Bengali–Assamese:
  - Assamese: দেখা (dekha)
  - Bengali: দেখা (dekha)
  - Sylheti: ꠖꠦꠈꠣ (dexá)
- Bihari:
  - Maithili: देखब (dēkhab)
- Odia: ଦେଖିବା (dekhibā)
Northern Indo-Aryan:
- Kumaoni: देखणो
- Nepali: देख्नु (dekhnu)
Northwestern Indo-Aryan:
- Punjabi:
  Gurmukhi script: ਦੇਖਣਾ (dekhṇā)
- Saraiki: ݙیکَھݨ (ḏekhaṇ)
- Sindhi:
  Arabic script: ڏيکَڻُ (ḏekhaṇu)
  
  Devanagari script: ॾेखणु (ḏekhaṇu)
Southern Indo-Aryan:
- Marathi: देखणे (dekhṇe)
Western Indo-Aryan:
- Gujarati: દેખવું (dekhvũ)
- Saurashtra: ꢣꢾꢒ꣄ꢒꢥ꣄ (dekkan)
- Marwari: देखणौ (dekhṇau)
- Romani: dikhel

[1]
Sheth, Hargovind Das T[rikamcand] (1923–1928) “देक्ख”, in पाइअ-सद्द-महण्णवो [pāia-sadda-mahaṇṇavo, Ocean of Prakrit words] (in Hindi), Calcutta: [Published by the Author].
[2]
Turner, Ralph Lilley (1969–1985) “*dr̥kṣati”, in A Comparative Dictionary of the Indo-Aryan Languages, London: Oxford University Press, page 371

Prakrit