Trudy sits next to 5 phonetic neighbors — Rudy, Judy, and Trudie are the closest matches by sound. Most share Trudy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"spear of strength"
"one who rules by the spear"
"the king"
"broad fortified settlement"
"rounded lump, cobblestone"
"friend (invented by J.M. Barrie from 'fwendy')"
"Famous warrior"
"valley peace; combination of Del (valley) and Fred (peaceful ruler)"
"renewed in spirit"
"paulownia tree, nobility (桐)"
"ever powerful"
"powerful ruler"
"rock, crag, cliff"
"white ford, ford of joy"
"Free man; from Germanic karl meaning man or free man, via Old Frenc..."
Similar sound: These names share phonetic patterns with Trudy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic ger + trud origins, giving them the same cultural heritage as Trudy.
Rhythm: Trudy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.