Muzakir is a direct Quranic name for boys that means one who reminds people of Allah, one who causes people to remember Allah. The Quran uses it to describe Prophet Muhammad(PBUH) in verse 88:21. BLANKENTER So remind them (O Muhammad), you are only one who reminds. (Quran 88:21)
Muzarib is an indirect Quranic name for boys that means striker, fierce attacker. It is the name of one of the Sahaba (companions of the Prophet (PBUH), whose full name is Muzarib bin Zaid. Muzarib is derived from the DHAD-R-B root which is used in many places in the Quran.