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
The name Sandy does not mean anything in Japanese, but can be written: サンディー
The name Mikeira does not mean anything in Japanese, but can be written: ミケイラ
The name Monica does not mean anything in Japanese, but it can be written: モニカ
Symantha/Samantha does not mean anything in Japanese, but can be written: サマンサー
"Charline" is not a Japanese word.
"Seriak" is not a Japanese word.
It isn't a word in Japanese.