Hello Anuradhag,
Adobe Reader DC is just designed for viewing PDF, you can read, highlight, print a PDF file or sign it easily but cannot always copy text from Word to PDF. It is normal.
Would you mind sharing more details about your query and the workflow? Which tool are you using to type your name in the Hindi language in PDF file?
The record shows that you have purchased Acrobat Pro DC(payment pending).
If the fonts don't have Unicode tables and they do not use a standard encoding for mapping the glyph indices to characters then you get garbage characters during copy/paste. You can try using the PDF Fixup Profile "Embed Fonts" in the Preflight tool to embed the font (if you are unable to reauthor the document). However, the font does need to be installed on your system and license to allow embedding in order to do this.
Is it possible to share the file with us so that we can test it at our end? If yes, share the file by private message only How Do I Send Private Message
Thanks,
Anand Sri.