Formal:
* Здравствуйте, Колин! (Zdravstvuyte, Kolin!) - This is the most formal way to greet someone, used for strangers or people you don't know well.
Informal:
* Привет, Колин! (Privet, Kolin!) - This is a casual and friendly greeting, suitable for friends and people you know well.
Slightly more personal:
* Колин, привет! (Kolin, privet!) - This is a more personal greeting, putting Colin's name first.
Adding "How are you?":
* Как дела, Колин? (Kak dela, Kolin?) - This translates to "How are you, Colin?" and is a common way to ask someone how they are doing.
Ultimately, the best way to say "Hello Colin" in Russian depends on the context and your relationship with Colin.