Three Syllable Names for Boys

This unusual English botanical name belongs to a minty-smelling, flowering herb (also called bishopwort), which has been used since medieval times to treat various ailments.
In the language of flowers, Betony signifies surprise, so this might make for a meaningful choice for an unexpected pregnancy.
Variant spelling Bettany (as in actor Paul Bettany, or English historian Bettany Hughes), could take this name into trendy surname-as-first-name territory.

Urdu and Pashto form of Alexander

The Arabic form of the biblical Solomon. It holds strong historical and religious significance, most famously associated with Suleiman the Magnificent, the longest reigning sultan of the Ottoman Empire.

Belshazzar was a Babylonian prince, a real historical figure who stars in a fictionalized tale Belshazzar's Feast, in the Book of Daniel

Dutch form of Baldwin

There were various villages called Edgecombe (and Edgcumbe and Eggcumbe) in Old England, particularly in present-day Cornwall and Devon. Local families adopted it as a surname — habitational surnames were extremely common among the English.

A rare but on-trend unisex name with roots in Bulgarian and Malay.

As classic as it comes in Italy — Filippo was once common during the Renaissance, and today remains in the Top 25.

A Greek name, derived from Sotirios, which references Jesus Christ.

Bastiaan is a common Dutch form of Bastian, a short form of Sebastian that stands on its own. While the double A is not intuitive for English speakers, the name is widely used in the Netherlands.

An archaic French form of the name Ingram, itself a rare, attractive last name option.

Attempts to update traditional Josiah have landed this name in the Top 1000. It falls in line with trendy spellings of names that opt for an additional x, y, or z whenever possible.

Livelier Latin form of Edmund.

A Middle English form of Adalbert (and therefore of Albert), which was the name of several Saxon kings. Nowadays, Ethel plus Bert is not a fashionable sound, but Albert is feeling fresh again.