Nails also mean kucha

A nail is a horn-like envelope covering the tips of the fingers and toes in most primates

Msumari, misumari comes from Arabic مِسْمَار (mismār, "nail [spike]; pin; wedge"), which, according to the English Wiktionary, was borrowed from Aramaic מַסְמָר‎ (masmār), מַסְמְרָא‎ (masmərā, “pin, nail”).