Deepak (दीपक / دیپک) is a Hindi word meaning "lamp", from the Sanskrit source word for light. The name Deepak symbolizes a bright future. In the twentieth century, it became very popular as a first name for male Hindus. Names like Deepa (now commonly also used for females), Deepika (female), Deepthi (female), Deepam (male), Deepali (female), and many others are related to Deepak.

The names mentioned above are related to light or the holder of light:

• Deepak (male) – a lamp or candle; meaning one who gives light on his own behalf
• Deepa (male) – a lamp
• Deep (male) – wick/flame of the lamp; Hindi/north Indian derivation of Sanskrit "Deepa" (male)
• Deepankar (male) – one who lights lamps
• Deependra (male) – lord of light
• Deepit (male) – lighted
• Deepanjali (female) – offerings of lamps
• Deepmala (female) – garland of lamps, tower of lamps
• Deepali (female) – collection of lamps
• Deepika (female) – a little light
• Deepamalika (female) – garland of lamps
• Deepunja (male) – light of a lamp
• Deepti/Deepthi (female) – glow, shine
• Deepanshu (male) – glow