Well done! This is quite a difficult name to get right. Although the Old English word for 'fern' - fearn - looks almost exactly the same as our modern word, the way people said the name has changed over hundreds of years, giving us modern Farlow. The name means 'fern tumulus', and a tumulus is a mound.
Some things to think about:
Why do you think Farlow was named after fern? How much fern was there in Farlow in the medieval period, do you think? What sort of mound is a tumulus?