Using a private search engine is critical if you want to keep your private data secure. Here are the best private search engines for 2020.

This is the best, deepest of all the privacy search engine lists I have encountered. Worth reading. It seems to get updated annually.

A clustering metasearch engine.

Dogpile.com is a popular commercial meta search engine.

Included only as an example of a commercial offering.

Transparent metasearch engine in Swiss quality. Simultaneously queries major search engines with one click.

Uncensored anonymous proxy search engine which claims to list web pages that Google censors.

This is described as a hybrid engine, meaning it gets it's main results from a different source which is not named, plus this is supplemented by it's own crawler. I don't know how the anonymous proxy part works (scant details on the site) but I can see this being useful for deep research.

This is quite a big privacy respecting meta search engine.

I'm guessing the backbone of it's search results come from Duck Duck Go and Qwant, supplemented by Mojeek and Gigablast. But it also searches Github, Gitlab, Project Gutenberg, Wikipedia and dozens more. This is worth trying. Metasearch.

A privacy respecting metasearch engine, run by a German non-profit. This engine has a 20 year track record.

Searx - a privacy-respecting, hackable metasearch engine

Yippy is a leading meta search engine metasearch providing results and topics for research and discovery.