So... I'm a language guy, but I want to drop some fun little knowledge.

The phonetics of Star Wars is rooted in modern language phonetics, but not English phonetics, so when you take Gro and gu and smush them together it sounds more awkward than say Yo and Da, both of which have very common real world phonetics, Da is Russian, while Yo is distinctly Japanese, as in Yo-kai.

So you are both correct.