Nikitaa = ni/nii + kit + aa = undertake/lead to + what is to be known + feminine form suffix = one who is close/quest of what is to be known, which is God. This is in Active Sense. In Passive Sense, it is an epithet for God.
NiKhitaa = ni/nii + kh + it + aa = undertake/lead to + space/divide + past passive participle/present active participle + feminine = one that has been divided up = earth or conquered as passive or one who has conquered/become victorious.
Needless to say both are related. ;-