It is interesting how same word evolves in two widely different places. In India, where most of the family names are derived from those of sages said to have been there in ancient times, an extra vowel is added to sage's name to make the family name of the descendants. Thus, the sage Prasher, would become family name Parasher. However, some, like me, write the name of the sage as such. Both Prasher and Parasher are encountered quite often in India. These have alternative spellings also as Prashar and Parashar.