"Rithvik" can be interpreted to mean "one who protects" or "one who is courageous." Here are some words that convey those meanings:
For "one who protects":
* Guardian
* Defender
* Protector
* Champion
* Savior
For "one who is courageous":
* Brave
* Valiant
* Bold
* Fearless
* Intrepid
It's important to note that these words are synonyms for the meaning of the name "Rithvik," not the name itself.