Shubh sits next to 4 phonetic neighbors — Shiv, Shubham, and Shubhang are the closest matches by sound. Most share Shubh's Sanskrit-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"auspicious, fortunate, blessed"
"unstruck divine sound"
"one who has attained liberation"
"brave warrior, fighter"
"one who has a portion of glory/excellence"
"skilled craftsman"
"the sun's warmth, solar light"
"ether, the fifth element"
"creative modern name, possibly connected to Sanskrit sky or happiness"
Similar sound: These names share phonetic patterns with Shubh — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Sanskrit origins, giving them the same cultural heritage as Shubh.
Rhythm: Shubh is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.