I think
Linden is still okay as a boy name, but has definitely moved toward unisex or feminine. My favorite boy tree name is simply
Ash.
Tacy looks like a misspelling of
Tracy,
Lacy or tacky. It reminds me of how little kids say my name before they can do the st blend for
Stacey. I think it could be okay as a nickname for
Anastacia, but otherwise I hate it.