佢 read "jì" from Hakka?
Yes there are Hakka varieties that have palatalised 佢 and other former velars in front of front vowels, specifically in various Hakka varieties of Jiangxi and Hunan (寧龍片, 于信片/雩桂片 and 銅鼓片/銅桂片).
Without context, it is rather difficult to determine the tone category of the phonetic &quot;51&quot;. But I shall assume it is a 陽平 tone.
A list of pronunciations for 渠 in a greater range of Hakka varieties can be found at zdic.net (where it also specifies that it is equivalent to Modern Standard Mandarin 他 for some varieties). I could not however find /tɕi51/ on the list, although there are several /tɕi24/ (陰平 tone, characteristic of 銅桂片).