I do not have access to specific information about how "Vikas" and "Arun" found out each other's names. To provide a relevant answer, I would need context about Vikas and Arun. Please provide additional details, such as:

• The source of the information: Was this in a book, movie, TV show, or real life?
• The context of their relationship: Are they friends, colleagues, or strangers?

With more information, I can try to find the answer for you.