Welcome to OpenStreetMap and thanks for adding these trees.

In general, the name tag is only used for trees with their own name, e.g. Major Oak in Sherwood Forest ( https://www.openstreetmap.org/node/455984558 )

To add the type of tree, you can use tags like species:en (for the common English name) and species (if known). If you would like any help with this, please let me know.

https://wiki.openstreetmap.org/wiki/Key:species:en
https://wiki.openstreetmap.org/wiki/Key:species