Who are past chovisi tirthankar
In Jainism, each "Chovisi" refers to a set of twenty-four Tirthankaras (spiritual teachers who have attained liberation and help others to achieve it). According to Jain tradition, there have been infinite time cycles in the past, and in each half-cycle (Avasarpini and Utsarpini), twenty-four Tirthankaras are born. The current set of twenty-four Tirthankaras belong to the present Avasarpini (descending time cycle). Before the current Chovisi, there have been countless previous Chovisis, each with their own twenty-four Tirthankaras.
The names and details of the Tirthankaras of the past Chovisi are generally not provided or specified in Jain scriptures, as only the current Chovisi (the present set of 24 Tirthankaras) is remembered and worshipped. The most well-known and revered are the current twenty-four Tirthankaras, beginning with Rishabhanatha (Adinath) and ending with Mahavira.
In summary, while Jainism teaches that there have been innumerable past Chovisis with their own sets of twenty-four Tirthankaras, the specific names and details of those Tirthankaras are not mentioned in available scriptures; only the current Chovisi is listed and venerated.