Perhaps from an unused root meaning to stand out, or exist; entity; used adverbially or as a copula for the substantive verb (H1961); there is or are (or any other form of the verb to be, as may suit the connection)
KJV Usage: (there) are, (he, it, shall, there, there may, there shall, there should) be, thou do, had, hast, (which) hath, (I, shalt, that) have, (he, it, there) is, substance, it (there) was, (there) were, ye will, thou wilt, wouldest.
H383 איתי 'ı̂ythayאיתי
(Chaldee); corresponding to H3426; properly entity; used only as a particle of affirmation, there is
KJV Usage: art thou, can, do ye, have it be, there is (are), X we will not.
H3448 אישׁי ישׁי yishay 'ı̂yshayאישׁי ישׁי
From the same as H3426; extant; Jishai, David’s father