Hardy sits next to 3 phonetic neighbors — Harvey, Harry, and Harley are the closest matches by sound. Most share Hardy's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bold, brave, daring"
"earth"
"resolute protector (from Liam/William)"
"knowledge, good judgment, deep understanding"
"one who sails, mariner"
"the Lord is my God"
"unity, excellence, number one"
"valley"
"glowing, scorching"
"grey, rocky land"
"charcoal merchant, coal worker"
"light-bearer, bringer of light"
"creative combination name"
"tail, conclusion"
"free ruler, powerful peace"
"possible Japanese aesthetic: figure, image"
"poet, bard"
"servant, attendant"
"deer, little deer"
"exalted father"
Similar sound: These names share phonetic patterns with Hardy — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French origins, giving them the same cultural heritage as Hardy.
Rhythm: Hardy is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.