I have been thinking about the Errey families that migrated and realized most of them were descendants of William Errey b 1778 Sussex England – d 1840 Sussex, England and Elizabeth Gurnett b 1780 Sussex, England – d 1859 Sussex, England.
Below is a breakdown of where this family and their descendants settled.
1. Mercy Errey b 1802 married Thomas Gilbert and they & most of their family migrated to the USA.
2. William Errey b 1804-1873 married Elsie Baitup 1805-1879 and remained in Sussex, England but two of their six children migrated to Australia. David Errey 1834-1916 and married his cousin Elizabeth Errey 1836-1880 after they arrived in Australia. Anne Errey 1838-1922married Robert Hazelden 1843-1881 who had passed away at the time of her migration, Anne and 5 or 6 of her her children migrated to Australia. One of William & Elsie’s other children George Errey 1832-1916 married Mary Jane Noakes 1830-1917 and two of their children migrated to Australia, Benjamin Henry Errey 1866-1945 & Catherine Jane Coppins 1870-1960 & five of their children and his younger brother Charles George Errey 1874-1931 and Gertrude Charlotte Trigg 1877-1955 & three of their children. Another son of George & Mary Jane’s children migrated to Canada about 1911, Frank Errey 1859-1944 and his wife Ellen Matilda Hall 1863-1945, and their ten children, nine girls and one boy most remained in Canada.
3. Hannah Errey b 1906-1870 married William Kenward 1800-1856 and their 3 children Elizabeth Kenward 1827-1893, Lucy Kenward 1927-???? and Willian Kenward 1831-1894 migrated to the USA.
4. Betsy Errey b 1912 married Jesse Barnes and remained in England. 
5. Thomas Peter Errey b 1815-1894 married Mary Rose 1813-1900, and their family of 7 children along with David Errey 1834-1916 a nephew mentioned above, migrated to Australia.
6. Benjamin Errey, brother to Thomas Peter Errey above b 1818- 1893, their youngest child, married Hannah Stevens 1820-1864, 2 years but after her death he married a widow Ruth Gaston They and most of their families along with a daughter of their own Ruth Errey 1868-1928 all migrated to Australia.
There are of course some other Errey family members that migrated but this family contains most of the Errey descendant families that left England to start a new life in lands far away.
You may well have a headache after try to understand this so I will include a family tree that may help explain it better.
Looking at the birth and death places will help identify the families and individuals who moved.
A pictorial family tree of the Travelling Errey Families may help
Neil Errey