From Germany to North America
The todays living Callenius-families have all their roots in Germany, as far as I have researched up to now. They were immigrants from Germany. Or - let's say - they emigrated from Germany. Mostly in a time, where there was a bad economic situation in Germany. Especially the years

Biggest Callenius-Family in the USA
One of the biggest or the biggest Callenius family has its center in Iowa. They are related to the German emigrant Adolf Friedrich Callenius. He was born at 06 June 1834 in Dorum. Son of Otto Christian Ludewig Callenius and Anna Elisabeth Heynsohn. So he is the grandson of the oldest Callenius - Otto Ludwig Callenius (1752 - 1828) - of the german root from Dorum. Here the baptist record of the curch Dorum from 1834:


"[Taufe am] 14 t[en] [Juni 1834] / Callenius Otto Christian Ludwig, pensionirter Fähnrich in Dorum, u. dessen Ehefrau Anna Elisabeth Heinsohn am 3 t[en] Juni geb. Sohn, gen. Adolph Fridrich. T[auf] z[eugen] Adolph Behen Leutenant in (Fade?) 2, Joh. Friedr. Jacobi. 3, Bernhard Callenius [Bem: ein Onkel]" [= baptist on 14 June 1834 / Callenius Otto Chruistan Ludwig, retired "Fähnrich" [kind of soldier] in Dorum, and his wife Anna Elisabeth Heinson, born on 3rd Jun, named Adolph Fridrich. Godparents Adolph Behen, lieutenant in (Fade?) 2, Joh. Friedr. Jacobi. 3, Bernhard Callenius [remark: an uncle]

Adolf Friedrich Callenius / Adolph William Callenius / Adolph F. L. Callenius Adolf Friedrich Callenius emigrated around 1860 to USA, he married there around 1860 Metta Eggers (his probable first child George H. Callenius was born on 30.07.1861 in New York) and lives for a short period in Illinois (1865) and settled finally in the same year in Baker, O'Brien, Iowa. In USA he named himself "Adolph William Callenius" or "Adolph F. L. Callenius". He died on 02.06.1914 in Primghar, O'Brian, Iowa  [source: Find A Grave].

George H. Callenius / Otto F.L. Callenius / William Callenius / Annie Callenius As far as I found out, beside of a doughter Annie (* 1867), Adolph had three sons: George H. (*1861), Otto F. L. (* 1862) and William (* 1873/74). From these children there are a respective amount of today living, Callenius named ancestors. Almost all today in Iowa living Callenius are related to this family.

Other emmigrants to United States

There are more emmigrants to North America. E.g. 

Carl F. Callenius: from Germany obtained 1856 the American citicenship and lived in New York.

Theodor Callenius: The 1840 born dealer from Bremen landed on 27. March1865 with a ship on Ellis Island. 

Dr. Jacob Callenius: He was born 1832 and will be a doctor. He landed 1867 with a ship and settled in USA. He lives 1880 in Massachusets, 1900 in Allegheny,Pennsylvania

Jacob Callenius: Antoher 1835 born Jacob immigrates 1871 into the USA.

Nathan resp. Nathan William Callenius: Immigrates 1883 into USA. Both parents are from Germany.

William Callenius is born in 1858 in Hesse. He settled 1883 in East Feliciana, Louisiana

Michael J. Callenius: He is said to have immigrated to the United States in 1885 and was born around 1870.

If you have Callenius roots, please let me know via email. I might can help you to find the link to the German ancestors.