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 Lochlann →Every word from Scottish Gaelic lachlann →Every word from English Lachlan →