Where does “Claudius” come from?

Claudius (Latin) comes from Latin claudus, from Proto-Indo-European ḱelh₂- — to pierce, strike; to stick; prick; stab.

Ancestry of “Claudius”, step by step

Step	Language	Word	Meaning
1	Latin	claudus	limping, lame; crippled; halting, wavering,...
2	Proto-Indo-European	ḱelh₂-	to pierce, strike; to stick; prick; stab

Claudius — Etymology, Origin & Word History | Etymology Explorer