Roser sits next to 3 phonetic neighbors — Rosa, Rosie, and Rosser are the closest matches by sound. Most share Roser's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Rosebush; rose garden"
"name of God, asked of God"
"joyful"
"hope, aspiration"
"little warrior, of Mars"
"golden one"
"Violet flower; variant of Viola from Latin viola"
"fair-haired, blonde"
"little flower"
"precious gift"
"full of sorrow, sorrowful"
"Exalted; sublime; high in status. A variant spelling of Aaliyah, th..."
"little warrior"
"Possibly from Eldon (noble hill, Old English) combined with feminin..."
Similar sound: These names share phonetic patterns with Roser — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Catalan origins, giving them the same cultural heritage as Roser.
Rhythm: Roser is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.