I'm not sure if we are talking about the same person here, but my great-great-great grandfather was Donald William MacLean, and he married a Catherine MacDonald. They had a family of seven children. I believe they came to Sydney, Australia in 1839 upon the "Heber". Donald William's father was Captain. Dugald MacLean, whose wife was Susanna MacLeod.
I hope this has helped, I have more information if it is relevant to you :)