Zawaad/Zawad is a non-Quranic Arabic name for boys that means "protector", "defender". It is pronounced [(Z)oom + r(U)n flo(W)er] [(WA)r(D)] and[(Z)oom + r(U)n] + [(WA)r(D)]. It is written as ذَوَّاد in Arabic and can also be written as Zawwad, Zawwaad, Dhawad, Dhawwad, Dhawaad, Thawaad, Dawaad in English.
Zawaad Arham Nur means "protector of a most merciful light" and Arham Zawaad Nur means "most merciful protector a light". It will have a stronger meaning of you write Nur as an-Nur, since then it means "the Light", which refers to God's guidance, instead of "a light", which could refer to any source of light. But it is your own choice.