उकार

Possibly from Sanskrit उकार (ukāra). By surface analysis, translingual උ (the letter) +‎ kāra (term designating a letter or sound) etc.

उकार m

1. Devanagari script form of ukāra (“the letter 'u'”)
   • c. 500 AD, Kaccāyana, Pālivyākaraṇaṃ [Pali Grammar]‎^[1] (overall work in Pali), page 11; republished as Satish Chandra Acharyya Vidyabhusana, editor, Kaccayana's Pali Grammar (edited in Devanagari character and translated into English), Calcutta, Bengal: Mahabodhi Society, 1901:

     ओकारुकारानं अन्‍तभूतानं सरे परे क्वचि वकारादेसो होति।

     Okārukārānaṃ antabhūtānaṃ sare pare kvaci vakārādeso hoti.

     Final 'o' and 'u' are sometimes changed to 'v' before another vowel.

   • c. 500 AD, Kaccāyana, Pālivyākaraṇaṃ [Pali Grammar]‎^[2] (overall work in Pali), page 291; republished as Satish Chandra Acharyya Vidyabhusana, editor, Kaccayana's Pali Grammar (edited in Devanagari character and translated into English), Calcutta, Bengal: Mahabodhi Society, 1901:

     वचवसवहादीनं उकारो वस्स ये ॥६॥
     वच, वस, वह इच्चेवमादीनं धातूनं वकारस्स उकारो होति य पच्चये परे । उच्चते, वुच्चति; वुस्सति; वुय्हति ॥

     6. Vacavasavahādīnaṃ ukāro vassa ye
     Vaca, vasa, vaha iccevamādīnaṃ dhātūnaṃ vakārassa ukāro hoti ya paccaye pare.Uccate, vuccate; vussati; vuyhati.

     Vac, vas, vah etc. which have 'u' for 'va'
     Roots vac, vas, vah and so on etc. have 'u' from 'va' next to the ending 'ya'.
     Exx: uccate, vuccate; vussati; vuyhati.