To determine how many of the index-economist pairings are correctly matched, we'll examine each pair and verify them against known data.

1. Human Development Index (HDI): This index is indeed associated with Mahbub Ul Haq. It was developed by him in collaboration with Amartya Sen, to assess the social and economic development levels of countries. Therefore, this match is correct.
2. Physical Quality of Life Index (PQLI): This index was developed by Morris David Morris. The PQLI is a measure to evaluate the quality of life or well-being of a country. This match is also correct.
3. Multi Dimensional Poverty Index (MPI): This index was not developed by Suresh Tendulkar. Instead, it was developed by the Oxford Poverty and Human Development Initiative (OPHI) and the United Nations Development Programme (UNDP) in 2010. Suresh Tendulkar is known for the Tendulkar Committee report on poverty estimation in India. Hence, this match is incorrect.

Now let's summarize:

• Human Development Index - Mahbub Ul Haq: Correct
• Physical Quality of Life Index - Morris David Morris: Correct
• Multi Dimensional Poverty Index - Suresh Tendulkar: Incorrect

Based on the verification, only two of the rows are correctly matched. Thus, the correct answer is Only two.