Need advice for my plant- needs a name and some help?

i live in the northeast. This was given to me about a year ago. It has grown to double its size. I've seen it growing wild in Hawaii. No name for it. My problem is that the leaves are slowly turning brown. It's watered once a week. Is it pot bound? Or is it a watering problem? Thanks y'all
q my plant needs a name and some help
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