Satoshi Nakamoto invented Bitcoin, and the smallest unit of Bitcoin (10e-8 BTC) is a Satoshi.
If Nicolas van Saberhagen authored Cryptonote, should the smallest unit of Monero (10e-12 XMR) be called a Saint Nic or Pico?
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The common usage is SI prefixes, with the first "mo" removed for ease of use (I forget the name of this speech concept). This was proposed by David Latapie, an early Monero core team member, though the blog post explaining those is now 404.
Here's an overview of all common Monero units taken from the official MoneroPedia:
So 1 monero is 1000 millinero, 1e6 micronero, 1e9 nanonero, 1e12 piconero.
If you're rich, you'd also have kilonero, meganero..