I saw your post at genforum. My father's uncle (Hillario) did indeed live in Ibarrangelua.I remember Ixthiar, Jesusmari, and Manuel-Angel. My sisters and one brother had a chance to visit back in the 80s.
They are all grown up.I think Manuel Angel was a teacher and Jesusmari ran a food stand by the shore.
Ixthiar and Manuel Angel both visited us separately.
I've been told of many Zuluagas in Colombia and Argentina by folks I knew when I lived in Miami (where there were more Zuluagas than I'd even seen).