"Didi" doesn't mean anything in Japanese. Maybe you're thinking of "didi" which is a Hindi word for elder sister. But hey, we all make mistakes, no judgment here. Just keep on learning and you'll get there!
Deniva does not mean anything in Japanese.
"Olga" is not a Japanese word or name, so it doesn't mean anything at all in Japanese. Did you mean, "What is the name "Olga" translated to in Japanese?"
The name 'Collin' does not mean anything in Japanese, but it can be written in Japanese as: コリン
Kaitlyn does not mean anything in Japanese, but can be written in Japanese as: ケイトリン
This does not mean anything in Japanese.
Krystle does not mean anything in Japanese, but can be written: クリスタル
It does not mean anything in Japanese, but can be written: マーラナ
what does it mean in English and I'll find out what it means in Japanese for you
what does it mean in English and i might have a chance of explaining it in Japanese
It does not mean anything in Japanese, but it can be written: ビンセント
The name Sandy does not mean anything in Japanese, but can be written: サンディー