It has been an important week for the Liverpool St school, which revealed they have adopted the H and are beginning to rebrand all their signs.
School board chairman Brad Gay said in a newsletter that the decision was made after consultation.
"Both boards [The Wanganui Collegiate School Board of Trustees and Whanganui College Board of Trustees] carefully considered this feedback and unanimously voted to add the h.
"The ministry have approved this name change and from the start of the 2019 school year the h will be added to Wanganui Collegiate School."
On Wednesday, the Blueshirts had their commissioning service in the school chapel. It is the third ceremony of the year and the first that the entire school attends.
"The commissioning service is held on the first day of the academic term and is where Blueshirts, our Year 13 leaders, are issued their official ties," Brown said.
"The ceremony is held on the first day of the term so that our entire school is in attendance to not only celebrate the 2019 leaders, but to inspire all students to look for these designated students for advice, guidance and influence."