The indefinite pronouns of a language, equivalent to English "someone" and "something," have no synchronic relation to other roots in the language.  For example, the Spanish indefinite pronoun <i>alguien</i> 'somebody' clearly traces back to Latin <i>ali-quem</i> 'INDEF.who,' comprised of an indefinite prefix and an interrogative pronoun.  However, modern Spanish <i>alguien</i> is monomorphemic and unique.

<br><br><b>Reference</b><br>
Haspelmath, Martin. 2008. Indefinite Pronouns.
In Haspelmath et al (2008), chapter 46. Available online at <a href="http://wals.info/feature/46">
http://wals.info/feature/46</a href>.
