Lachlan sits next to 4 phonetic neighbors — Logan, Lochlan, and Lochlann are the closest matches by sound. Most share Lachlan's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"land of lakes"
"the color gray, from the gray lands"
"from the city of lions"
"sweetheart, dear one"
"one who serves"
"dove (short for Callum from Scottish Gaelic)"
"little fawn"
"merciful, gentle"
"Lord have mercy (liturgical)"
"good man, strong man"
"son of the army ruler"
"stony meadow"
"tile maker (short for Tyler)"
"son of"
"from the city of Troy"
"chief, leader"
"land of lochs, land of fjords"
"great town"
"son of the cloud"
"defender of men"
"dark blue water"
Similar sound: These names share phonetic patterns with Lachlan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic origins, giving them the same cultural heritage as Lachlan.
Rhythm: Lachlan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.