The 3rd person pronouns of a language are either identical or derivationally related to its <i>remote</i> demonstratives.  Consider Eastern Armenian, in which the 3rd person pronoun <i>na</i> is the same as the distal demonstrative <i>na</i>, but unique from the proximal <i>sa</i> and medial <i>da</i>.

<br><br><b>Reference</b><br>
Bhat, D. N. S.. 2008. Third Person Pronouns and Demonstratives.
In Haspelmath et al (2008), chapter 43. Available online at <a href="http://wals.info/feature/43">
http://wals.info/feature/43</a href>.
