That dropdown matches the MapPress fields to the custom fields that already exist in your system (i.e., where one or more posts has those fields). Because ‘meta-name’ is specific to your system I can’t tell you if it’s the right field to use for POI titles – you’ll need to try it.
Also in case it helps, here are two other things to know about titles:
1) If you use an address instead of lat/lng in the geocoding fields, the plugin will show the address as the title by default.
2) In mashups, you can set the plugin to display the post title rather than the POI title.