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"
"treasure, to store (possible Arabic root)"
"of Dionysos, god of wine"
"divinely selected (spiritual connotation)"
"from the rye field"
"cloud"
"lover of hounds, hound-desiring"
"beloved of God"
"woodland"
"from the roe deer land"
"spiritually reborn through baptism"
"God's peace, divine peace"
"crowned with laurels, victorious"
"gift of God, gift of Yahweh"
"elf warrior"
"power, strength, ruler"
"song, singing bird"
"messenger, herald"
"king"
"modern invented name, energetic spirit"
"narrow, a strait"
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.