Not really. Japanese as a spoken language predates writing systems, and words like "koko" are yamatokotoba (original Japanese), not loans from other languages. It was first written in kanji (Chinese characters) because that was the only script they had initially, hiragana and katakana came later.
To confuse things even more, 此処 is valid Chinese as well, but the pronunciation is unrelated, they just mapped the meaning on top. This is also fairly common, to the point that there's a technical term for it (jukujikun).