It is generally agreed that the nominatives ov and oy are formations from the demonstrative stem u which appears in most of the modern Indo-Aryan languages, e.g. Nepali: direct u, oblique us.
In the oblique formsles, la and lenMiklosich {ber die Mundarten und Wanderungen der Zigeuner Europa's xi, p. 15) saw the stem of Skt. ta, which forms the oblique cases to the nominative s and s. Professor A. C. Woolner (Journ. Gypsy Lore Soc., New Series ix, p. 128) opposes this view for the very cogent reason that there seems to be no other instance in which an initial IndoAryan t has become lin European Romani: it becomes I regularly only in the intervocalic position. He derives it instead from a Prakrit pronominal stem na. This however presents nearly as great a phonetic difficulty, for the regular representation of initial n is by n : there are a few exceptions only in some cases of metathesis or dissimilation, such as len river (if from nodi), lilai and linai beside nilai summer (nid;ghh).