I have always thought that each girl got her name just the opposite of that was going on in her life.
Tapasya got her name which means "to repent" but throughout her life she has had everything she ever wished for, she has always enjoyed her life, rich, money, wealth, education, good husband (veer), love of mother in law (Mai), very good parents, a much loved grand mother (nani), shopping, lovely car, nice rich friends (sid) etc Tapasya's deeds were corrupt and black, she was a lier and not nice, she was snob with huge attitude problem etc she used people.
Whereas as Ichcha which means "wish " throughout her life Ichha has struggled along with her mother, poverty, humiliation by nani and her brood, divya, Mai, Veer though loved her but did not trust e.g Satya and Tapasya...no father's presence in her life even though Jogi was there but Tapasya never liked her, always hated her, Vansh who suspected her, got widowed, hatred from mai, chanda, Dadda ji but her deeds were good, she always helped others, was down to earth with no attitude problem, always helped others. always spoke the truth, people used her...
Ichcha always wore or got Tapasya's uttaran.
I aways thought that Tapasya should have gotten the name of Ichcha since her every wish was completed and Ichcha should have the name Tapasya since she had done the Tapasya throughout her life.
But at the end of it now what is going on in the serial, because of the deeds karm of each girl, their names became true to their life according to whatever is going on in their lives. Ichcha has got love of her parents in laws her husband three kids her Ichcha for good life came true whereas Tapasya lost Veer, In laws, her new born baby, she lost her father's love, was thrown out of the house both by her parent and husband, sent to jail, humiliated in the hotels and by many people and Rathor, and she cannot have a child again ever so she is the one who is doing the Tapasya...one positive thing that happened is that she once again got her father's love and her husband Rathor loves her very very much...May be one day her Tapasya will end and her Ichcha to have a child will be completed and may be she will be reunited with her lost baby. I pray for her.