Correct spelling for the English word "arow" is [ˈaɹə͡ʊ], [ˈaɹəʊ], [ˈa_ɹ_əʊ] (IPA phonetic alphabet).
The word "arow" is actually a variant spelling of the word "arrow". The etymology of "arrow" can be traced back to the Old English word "arwe" or "arwa", which is related to the Old Norse word "ör", both meaning "arrow". These Old English and Old Norse words are believed to have been borrowed from a Proto-Germanic word "*arhwō" or "*arkhwan", which also meant "arrow". The exact origin of this Proto-Germanic word is uncertain, but it is believed to be related to the Proto-Indo-European root "*arku-", meaning "bow". So, the etymology of "arow" is essentially the same as that of "arrow".