There are 1349 townlands in Westmeath. In my PhD thesis (NUIG 2012) [can be downloaded here], I carried out a study of the names of 276 of these townlands (encompassing the baronies of Kilkenny West and Clonlonan).
I am currently working, in particular, on the townland names of the adjacent baronies of Brawny (61 townlands) and Rathconrath (163 townlands).
Ultimately, I intend to produce a comprehensive study of all 1349 townland names in Westmeath – the outcome of this study will be a monograph, provisionally titled Language in the landscape: linguistic and settlement change as evidenced in the placenames of Westmeath. The authoritative Irish-language forms of the names which emerge from the study, and the historical evidence, will be published online and linked to Logainm.ie, The Placename Database of Ireland.