Martha sits next to 3 phonetic neighbors — Marta, Marsha, and Marlene are the closest matches by sound. Most share Martha's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"mistress, lady of the house"
"land of mountains"
"star"
"goddess of spring"
"renowned in battle"
"hillside by the pool"
"leaping water"
"Trojan prince"
"wonderful, admirable"
"sea pearl, variant of Mary/Marina"
"island of wild boars (alternative etymology)"
"new light in the clearing"
"reward, wages"
"the end, night rain"
"little Laura"
"army host, expedition"
"graceful, beautiful"
"my sweetness"
"shining light"
"strong-headed, determined"
"God is my strength"
Similar sound: These names share phonetic patterns with Martha — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Aramaic origins, giving them the same cultural heritage as Martha.
Rhythm: Martha is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.