Nixon sits next to 4 phonetic neighbors — Dixon, Mason, and Jackson are the closest matches by sound. Most share Nixon's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Nicholas, son of Nick"
"messenger"
"jet-black, swift"
"son of Jack"
"younger, the son"
"mind, intellect, spirit"
"none compares to God"
"God is gracious"
"inheritance, bequest"
"brave in battle"
"poet, bard"
"rock, stone"
"from the fen, marshland dweller"
"first zodiac sign, new beginnings"
"rock, harmony"
"protector of people"
"open grassy land"
"bridge worker or keeper"
"narrow, a strait"
"short form of Benjamin: son of the right hand"
Similar sound: These names share phonetic patterns with Nixon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have English origins, giving them the same cultural heritage as Nixon.
Rhythm: Nixon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.