Manx orthography was phonetic - the parish clerk(baptismal reg) or enumerator(early censuses) would have filled in the form - the name could be rendered as stephenson, stevenson - the 'son' could well be dropped (esp by those more familiar with Manx) and the name rendered steven/stephan(s) or in earlier Manx speakeres Steane.
The old Jurby school house still stands (or did but not checked recently) across a field from the parish church - there was a new school built in 20th C (the latest school was built 1982) but first school is mentioned in a deed North Side Sales Oct 1766 #40
[Jurby Schoolhouse]dated 25 May 1766;recites that Jurby has hitherto been without a schoolhouse convenient for Master + Scholars - a public meeting on Monday last when most of inhabitants then assembled resolved to have sd inconvenience removed each contributing according to their respective holdings towards building a proper suitable and convenient school-house;John Mcylvorrey offered a parcel of his tenement which was very well approved of - John Mcylvorrey + wife Anne sell for £1 4s 6d to Revd Wm Crebbin + wardens a parcel of qtrland adj Capt Christian estate of East Nappin on northeast, road on south, another parcel of our estate on northwest;witt John Killip x, Adam McBooy;setting quest place 1d rent

In 1831 had about 20 pupils (see IoM Charities on manx note book)- some history is mentioned in Hinton Bird "An Island that led " vol 2 - after the 1872 act all parochial schools were to be transferred to the new local education committeesbut Jubry was first closed by appointment of a new master then by the Vicar orver rights of access - finally a transfer happened in 1879 (the newspapers have more detail)