Font Substitution

I’m using libreoffice on Mac OS 10.12.6. I have a document containing Hebrew language text in “gill sans” but Gill Sans doesn’t cover the Hebrew character set and I’d like to figure out what font is being substituted.

I’m using LibreOffice on Ubuntu, and I like the font being substituted in some documents on my machine - would like to use the same font in other documents, but can’t work out what it is.

this might help How do I identify a substituted font?