Bruce Lee studied even fencing techniques but his first style was Ving Tsun ( Wing Tsun)& it evolved into Gung fu ( was Thai boxing influences).
He also liked western boxing, his ground work was from Japanese Jui jitsu & Judo but he also learned about Russian Sambo. There was also western wrestling influences in there, in other words anything he found worked.
If you read his books you can see what he was doing & his later idea of Jeet kune do ( flexibility nothing carved in stone, use what works for you)
The strong Kali influences come from his friend Guru Dan Inosanto