It is not known whether Elkanah was born in England or America. There are references to an Elkanah Johnson elsewhere, but if that was the same individual as this, that fact is unclear. An Elkanah Johnson was summoned to the Plymouth Court on 1 June 1669; an Elkena Johnson served on a jury at Newport in May 1674. The earliest reference to Elkanah in the west bay area of RI is a 1705 East Greenwich land record identifying him as "Elkany Johnson of East Greenwich."
In February 1726/27, "Alkanah" Johnson contributed to the building of the meetinghouse for the Six Principle Baptist Church of East Greenwich.
(Source for the above information: Linda L. Mathew in "A Line of Descent from Elkanah Johnson of Coventry . . ." in RI Roots Magazine, Vol. 29, No. 3, p. 113 - 115)
Linda Mathews also suggests that Elkanah may have come to East Greenwich from Newport, as did Elisha Johnson, who bought land at East Greenwich 14 August 1715. The similar names of some of their children may indicate that they were related.