Python is easy 'cause the other meaning is a real noun, so disambiguation is easy.

Kind is a general word, another tech project, and also a programming term.

just an opinion ofc :)

I think you should be fine if you call it "kindlang" or "kind lang" everywhere.

You have to understand that the languages Python, C, and even Ruby have been around for a long time, and I would wager SEO mattered much less when they were being created. This is obviously true for C, and arguably true for the others. To boot, many of them are often searched for with "(programming) lang(uage)" as an associated query.

Similar arguments follow for the rest (Go/Swfit/Rust are supported by big companies, Perl is a unique string, etc.).

What is unfortunate for your language is that Kinds are something associated with PLs theory AND it also seems to be that many people are interested in searching for "what kinds of programming languages are there?" ("kind" in the sense of "type of language").

If I were you, I wouldn't let it get to me – I think this project is cool regardless of name. But if popularity matters to you, maybe try and emphasize "kindlang".