Philip McLachlan - Spelling of McLachlan

Spelling varies greatly in records for McLachlan.

Philip's birth certificate (in 1796) spells McLachlan as McLachlane, and states his father Donald's also as McLachlane.
Source: National Records of Scotland. The Old Parish Registers Births 644/1 190
Glasgow. August 1798. Page 395
McLachlane Donald McLachlane, Shoemaker, & Mary Stewart. Son Philip, bo: 25th. Witnessses: Duncan McLachlane & James Brown.

Philip's father Donald's Donald MacLachlan Marriage Record, spells it McLachlan.
Source: National Records of Scotland. Old Parish Registers Marriages 564/1 40 170 Greenock New or Middle.
1788. ​
McLachlan February 16 Donald McLachlan Shoemaker. & Mary Stuart. Daughter to Peter Stuart both in this Parish - 2 days.
Stuart

Of Philip's siblings, the following spellings are used on their birth certificates:
Lachlan McLachlane Lachlan McLachlan
Jean McLauchlan Jean McLachlan
John McLachlane John McLachlan
James McLachlan James McLachlan
Bogle McLachlane Bogle McLachlan

According to the Norval website, the ship's register for Philip's arrival in Cape Town South Africa aboard Moodie's Ship “Brilliant” on the 23 August 1817 lists "Philip and Alex. McLachland" .
https://norval.co.za/the-ship-brilliant-comes-to-south-africa-1817/

Philip's children and later South African lineage used and continue to use the McLachlan spelling, i.e.
Philip Hendrik Bernardus McLachlan
John William McLachlan