Liam sits next to 3 phonetic neighbors — Leah, Liana, and Lyam are the closest matches by sound. Most share Liam's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"resolute protection, helmet of will"
"divine, noble"
"stern, strict, severe"
"heavenly mist, here in heaven"
"modern melodic invented name, variant of Kehlani"
"modern blend name"
"thankful, one whom God hears"
"from the Adriatic, flock of God"
"spear ruler"
"rose pool, pretty lake"
"oak tree"
"sweetness, golden nectar"
"thunder goddess, feminine form of Tyr"
"gracious gift"
"lyric, of or relating to the lyre, suitable for singing"
"God will add, God is gracious"
"azalea flower"
"west wind, gentle breeze"
"rye meadow"
"set apart, sanctified"
"work, industrious, vigorous"
Similar sound: These names share phonetic patterns with Liam — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish form of William, from Germanic wil and helm origins, giving them the same cultural heritage as Liam.
Rhythm: Liam is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.