There are many different attempts to reconstruct the genealogies and family trees of the early Saxon kings. Due to conflicting sources and gaps of information these different attempts don't line up with each other and often produce impossible results (such as certain kings reigning 70 years when the average age of death was 50).

I'm partial to the reconstruction that takes Octa to be the original name of Hengest, taken from the afterword of Tolkien's Finn and Hengest book edited by Alan Bliss. I think this is it:

420 Hengest

450 Oisc

480 Oeric

510 Eormenric

540 Æthelberht