Wow, I like how many different versions of this round there are. My dad thought that "ducha moya" (though none of us would have known to spell it that way) might be a corruption of Timisoira (a city in Romania), I guess not, but it's cool to imagine some kind of wild carpathian landscape.
Our lyrics were:

Young Rider, Apple-cheeked one
Come hither riding
On your horse so proud and prancing
Come hither riding
No matter where I ride,
Slavic mountains at my side
Ducha Moya Ducha Moya