G. E. Amarasekara
Amarasekara Family tree going back to 1640
AMERESEKERE, Don Johannis, Muda-
liydr; b. December 25, 1822. His
grandfather held office under the Dutch
Government. His father, Don Daniel
Ameresekere, was Mohandiram of
Hewegama Korale. Residence : Han-
wella.
AMERESEKERE Ekanayaka Kulatil-
leka, James, Mudaliydr; b. October
10, 1848. Is a lineal descendant of
Arthanayaka, Prime Minister of Raja
Sinha II., King of Kandy, who reigned
from 1627 to 1676. Is Mudaliydr
of Pitigal Korle, Chilaw district.
Residence : Nattandiye Wallawwe,
Marawila.
https://www.ebooksread.com/authors-eng/roper-lethbridge/the-golden-book-of-india-a-genealogical-and-biograhical-dictionary-of-the-rulin-hci/page-60-.shtml?fbclid=IwAR1609s93FgnbxmtQzVgvKO_Xo-voTGkvkGFu1-KjJf79tsDTigvL6T6gxk
It looks lik e only Hanwella clan has Don. Persue this lead. 
James Ameresekara of 1848 can be the Grandson of Henry, Son of Samuel Raphael. 
This shows only two sons for Daniel Amarasekara, while Attanayake family tree shows 3S+1D. I wonder if he had another son, Don Johannis Mudaliar
https://www.familysearch.org/ark:/61903/3:1:3Q9M-C9BQ-N922-L?i=745&cat=390044 Colombo District/Collaatian division Marriages
Sooraweera Arachchigge Don Daniel Amarasekara Mohandiram (would be the father of Don Johanis Amaraseakara who received 1/8th of land from Lewuna Amarasekara) married Chachrawartige (Kuruwitage as record below shows) Abraham Pererage Peternela Perera on 12 July 1807 and had a daugter Nethalia DOB 1808 at the time of registration 
Corowitagey Perternella Perera's parents marriage.(few records after hers)
https://www.familysearch.org/ark:/61903/3:1:3Q9M-C9BQ-N9XX-G?i=746&cat=390044
This proves that registration of marrieages occurred many years later, even after many children were born