With help from a very distant cousin and the SRO, I have traced my Macro's back to William Macrow born in 1638 in Dalham, Suffolk, the fifth son of Arthur Macro and Ann.
SRO looked for Arthur in Ousden, Hargrave, Denham, Gazely and Moulton with no success.
Macro, Macrow, Macroe, Macrowe were living in the following Suffolk villages about this time:
Cavenham, Glemsford, Great Welnetham, Fornham All Saints, Risby, Shimpling, Lavenham, Levington, Aldeburgh, and Bury St Edmunds.
Any suggestions for further research appreciated.