March sits next to 4 phonetic neighbors — Marcy, Martha, and Marsh are the closest matches by sound. Most share March's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the third month, heralding spring"
"powerful one"
"alder tree, from the alder grove"
"from the kingdom of Lothar, from the Lorraine region"
"lily, rose"
"other, foreign"
"from the high stronghold, fortified place"
"One who tends or holds; occupational name related to tenner"
Similar sound: These names share phonetic patterns with March — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as March.
Rhythm: March is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.