This looks like a Pachira aquatica (Money Tree). You can pot it up to a larger pot, but I would not go larger than a gallon size pot. And you can easily straighten up the plant when you repot it if you'd like it to be more upright.
On another note, looks like the tie that is holding the trunks together about half ways up are starting to girdle the trunks. I would loosen those some and move them to a different section of the trunks.
