This is all pretty confusing, but here goes.
This entry has several errors. The first attempt to settle the present area of Bergen COunty was in 1639-40 when settlements were made at Edgewater and Bogota. Remember, however, that the section originally known as Bergen Township became Hudson County in 1840. While there has been debate over the years, "Bergen" probably refers to the "mountains", otherwise known as the Palisades. The original village of Bergen was made in the Journal Square section of Jersey City Heights.
Oratam, sagamore of Ackin-sak, deed the area now covered by Teaneck (south of Cedar Lane), Bogota and Ridgefield Park, lying between the Overpeck Creek and Hackensack River. The remainder of the County was sold off by the native proprietors by various deeds: mostly, these lands belonged to dialectally and culturally distinct clans, affiliatated with the Manhattans and Minisinks, locally known as the Pequannocks and Tappans.
The English took over New Netherlands in 1664 and New Jersey was given by James, Duke of York, to two Royalist supporters, Lord John Berkeley and Sir George Carteret of the Island of Jersey. New Barbados was the precinct or township between the Hackensack and Passaic Rivers. The original Indian village of Hackensack was located on Kips Bend in Teaneck and Hackensack Township long remained the section between the Hackensack and Overpeck Creeks. The name drifted across the river to the first Church, where the County Seat was subsequently located, but the City of Hackensack was not officially known as such until 1921 (I believe)
As to the County Seal, I do not believe this is of great antiquity. I did research once on the Sussex County Seal and found out that it was adopted in 1964, during the NJ Tercentenary. I suspect the same is true with Bergen, though I am not certain. It was re-drawn or "modernized" in 1983 for the County's Tercentenary.