The quote, "First rule of magic: Don’t let anyone know your real name. Names have power," emphasizes the significance of identity and the power it holds. In many cultures, names are believed to hold a certain power, a spiritual energy, and a deep personal connection to the individual. This power is seen as something that can be used for good or ill. Therefore, in the context of magic, knowing someone’s real name is akin to having control over them. It’s a way of gaining an upper hand, a form of power. This concept is often seen in folklore and mythology, where a creature’s true name holds the key to controlling or defeating it.

In today’s world, this idea can be seen in the way we manage our personal information, especially in the digital age. We are often cautioned to not share too much personal information online, as it can be used against us. This could be in the form of identity theft, cyberbullying, or even manipulation by those who know us well. Thus, our "real name" can be seen as our personal data or information. The more someone knows about us, the more power they potentially have over us.

In terms of personal development, this quote could be interpreted as a call to be cautious about who we reveal our true selves to. Not everyone should have access to our deepest fears, dreams, and secrets. It’s about setting boundaries and protecting our inner selves. Additionally, it could also be about understanding the power within ourselves that comes with our identity, our ‘name’. Recognizing this power, and knowing when and with whom to share it, is a significant part of personal growth and self-awareness.