[Ayesh]

Noto (https://www.google.com/get/noto/) is a popular font that contains glyphs for all languages. It's a gigantic 1.1 GB file.

I'm involved in fonts for my native language (Sinhalese), and let me tell you: dealing with fonts for multiple languages are is not easy! Some of the Asian languages including Sinhalese are pretty difficult to get right, and glyphs are quite difficult to give a character without breaking their meaning, specially when it comes ZWJs, diacritics, etc.

You can subset a font like Noto to serve your languages, but it will come pretty large. Note that for web, @font-face declarations can set a Unicode character range for each font file, so browser downloads those fonts only when necessary.