Though not stated specifically, the fact that it is plural indicates 2 or more.
We are not told.
Jabez Hughes died in 1731.
Jabez Turner was born in 1828.
Jabez Turner died in 1899.
Jabez Darnell died in 1950.
Jabez Bryce died in 2010.
Jabez Bowen died in 1815.
Jabez Whitley died in 1904.
Jabez Whitley was born in 1837.
Jabez Wolffe died in 1943.
Jabez Balfour died in 1916.
Jabez Upham died in 1811.