Standard sits next to 4 phonetic neighbors — Stanford, Stanley, and Stafford are the closest matches by sound. Most share Standard's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rallying banner"
"line of rulers, powerful family succession"
"one who crosses; toll collector at a crossing"
"painted, speckled"
"from Darney (place name)"
"lightning"
"openness, frankness, sincerity"
"noble family origin from Normandy"
"possibly derived from Noah (rest, comfort)"
"beloved, dear"
"golden, yellow-haired"
"rocky hill, outcropping"
Similar sound: These names share phonetic patterns with Standard — 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 Standard.
Rhythm: Standard is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.