'Stoic' was named after Athens' Painted Porch (Stoa Poikile) where Zeno taught. From PIE *steh- (to stand).
Enduring pain and hardship without showing feelings or complaining; relating to the ancient Greek school of philosophy founded by Zeno of Citium.
From Latin 'Stōicus,' from Greek 'Stōïkos' (Στωϊκός), meaning of or pertaining to the Stoa, referring to the 'Stoa Poikilē' (Painted Porch), a colonnade on the north side of the Athenian Agora where Zeno of Citium taught his philosophical system around 300 BCE. Greek 'stoa' (στοά) meant a roofed colonnade or porch, from the root 'sta-' (to stand), related to Proto-Indo-European *steh₂- (to stand). The philosophical school took its name from the building, and the adjective later generalized to describe the temperament the school advocated
The Stoa Poikilē (Painted Porch) that gave Stoicism its name was famous not for philosophy but for its paintings — battle scenes by the great artists Polygnotus and Micon. Zeno chose it simply because it was a popular public gathering place. The most influential school of Roman philosophy was essentially named after a building's artwork.