Where does “Lachie” come from?

Lachie (English) comes from English Lachlan, from Scottish Gaelic lachlann, from Middle Irish Lochlann.

Ancestry of “Lachie”, step by step

Lachie traces back through two separate lines of ancestry.

via English Lachlan

StepLanguageWordMeaning
1EnglishLachlanmainly used in Scotland, recently also popular in Australia
2Scottish Gaeliclachlann
3Middle IrishLochlann

via English ie

StepLanguageWordMeaning
1EnglishieAlternative form of i.e
Every word from Middle Irish LochlannEvery word from Scottish Gaelic lachlannEvery word from English Lachlan
Lachie — Etymology, Origin & Word History | Etymology Explorer