It seems to be a widely repeated "fact" which can't be traced to anything particularly authoritative:
replyhttps://britannica.com/topic/Claude-AI
Looks like the 2023 NYT article started it, and it uses this as reference:
> depending on which employee you ask, was either a nerdy tribute to the 20th-century mathematician Claude Shannon
Personally I always associated it with the silent protagonist from GTA3.