Tag sits next to 4 phonetic neighbors — Dag, Tad, and Tab are the closest matches by sound. Most share Tag's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"label, identifying mark; to touch lightly"
"dweller by a spring or well"
"curved throwing stick, boomerang"
"hill, elevated"
"shield wolf (derived from Randy/Randolph)"
"old river, ancient waters"
"noble kind"
"lean, thin one"
"golden brown; tawny"
"fond of horses"
"adventurous, wanderer"
"one who tames"
"who is like God?"
"chubby, stout little one"
"shield wolf, brave protector"
"invented name with La- prefix (the) and Voris (from the ford, Dutch..."
Similar sound: These names share phonetic patterns with Tag — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse/Low German origins, giving them the same cultural heritage as Tag.
Rhythm: Tag is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.