What is the naming convention for Sn and Pb in inter-metallic compounds?
After doing some digging I've found evidence to support that tin based inter-metallic compounds should be named 'stannide' such as in the paper by Fickenscher et al. [1].

Reference


Fickenscher, T.; Rodewald, U. C.; Niehaus, O.; Gerke, B.; Haverkamp, S.; Eckert, H.; Pöttgen, R. The Stannides $\ce{RE3Au6Sn5}$ $(\ce{RE} = \ce{La}, \ce{Ce}, \ce{Pr}, \ce{Nd}, \ce{Sm})$ – Synthesis, Structure, Magnetic Properties and $\ce{^{119}Sn}$ Mössbauer Spectroscopy. Zeitschrift für Naturforschung B 2015, 70 (6), 425–434. DOI: 10.1515/znb-2015-0050.