His second but eldest surviving son, the second Baron, served as President of the Royal Geographical Society from 1945 to 1948. He had no male issue and was succeeded by his nephew, the third Baron. He was the only surviving son of Commander the Hon. Gustaf Guthrie Rennell Rodd, youngest son of the first Baron.
The third Baron was a Scottish international rugby player. The title is now held by his son, the fourth Baron, who succeeded in 2006.
The first Baron was the grandson of Sir John Tremayne Rodd, a vice-admiral in the Royal Navy, and a great-grandson of the geographer, historian and a pioneer of oceanography, James Rennell. The Conservative politician and life peer the Baroness Emmet of Amberley was the eldest daughter of the first Baron.
Barons Rennell (1933)
- (James) Rennell Rodd, 1st Baron Rennell (1858–1941)
- Francis James Rennell Rodd, 2nd Baron Rennell (1895–1978)
- John Adrian Tremayne Rodd, 3rd Baron Rennell (1935–2006)
- James Roderick David Tremayne Rodd, 4th Baron Rennell (b. 1978)
There is no heir to the barony.
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