The cause papers of the Diocese of York are now available online and range from 1300 to 1858 and references to places in Salford Hundred. Search the nearly 14,000 cases from the church courts here.
In 1234 the advowson of Eccles Church was granted to Stanlaw Abbey (the Abbey later moved to Whalley). The details of the Abbey lands and the history of Eccles can be found here.
Ekwall’s Place-name’s of Lancashire (p37-42) mentions some of the names in the list shown above, “Westslak” for example.
The Slack (in Monton) : del Slake 1323 LI. Cf. [le] Westslak 13 cent. WhC 878.
M.E. slack (from O.N. slakki) a small, shallow dell or valley,” etc.
You can download Ekwall’s Place-names of Lancashire here.