I'm not one to ask about phonetic writing/spelling, for Germans it would be "Gerrija" or "Gerriya", but then again when I actually speak, I always struggle with the very pronounced "r" in Spanish myself because where I come from, we hardly pronounce any r...

The guy in my link pronounces it very well though, it's just whatever you write, different people will say it in a different way depending on their native language and accent I guess. I found a German youtuber who just said "gorilla" (same in German and English) and sold that as the correct pronunciation, but that's just wrong.
The double "L" in Spanish is always pronounced like a "y" or "j" in English and German. So Mallorca is pronounced "Mayorca" and guerrilla is like "geriya" (the "u" after the g is silent and only serves to make the g a hard sound instead of a soft one) and so on.

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