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"
"from the new estate"
"of/from Sean — modern American creation"
"security token"
"person with extraordinary talent"
"of or relating to an epic poem"
"steadfast, strong"
"son of Stephen, one who wears the crown"
"from Renton, town name"
"settlement on the heath"
"royal power"
"fair-haired one"
"warrior, military companion"
"ruler of the army"
"variant of Elias: my God is Yahweh"
"descendant of Rian"
"manly, strong, brave"
"supplanter, held by the heel"
"the new house"
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.