Does the license on theses fonts allow using them in this manner? (That
is: As part of an official logo, not just as part of a page.) It's
probably good to check first here.
All of the fonts on Google Fonts that I have checked are licensed either
under the SIL Open Font License v1.1 <https://scripts.sil.org/cms/scripts/page.php?item_id=OFL> or the
Apache License v2.0 <http://www.apache.org/licenses/LICENSE-2.0>.
In my understanding, both allow using the font for a logo.
But please feel free to double check!
Remember that fonts are licensed as software, not as artwork.
We can of course also use other sources of libre fonts, but I don't know of any repository as large and varied.
C