Rockland sits next to 5 phonetic neighbors — Roland, Rowland, and Rocco are the closest matches by sound. Most share Rockland's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rocky land, land of rock"
"ruler, king (from -rick suffix)"
"dark-haired chieftain"
"dark, full; complete darkness"
"fifth (born)"
"son of Lars"
"beloved, dear one"
"from the lake"
"priceless, praiseworthy"
"drawn out of the water"
"rejoice; pure"
"steadfast, strong"
"descendant of Rian"
"from Airelle (place in Normandy, France)"
"dawn, new beginning"
"Son of Neil; champion lineage"
"vigilant, watchful"
"from the Afton river"
"from Hadria, dark and rich"
"court officer, legal summoner"
"he who heals with herbs"
Similar sound: These names share phonetic patterns with Rockland — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English/Old Norse origins, giving them the same cultural heritage as Rockland.
Rhythm: Rockland is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.